diff --git a/lv_draw/lv_draw_img.c b/lv_draw/lv_draw_img.c
index 0f7fa5153..2d81dbbe3 100644
--- a/lv_draw/lv_draw_img.c
+++ b/lv_draw/lv_draw_img.c
@@ -305,7 +305,7 @@ static lv_res_t lv_img_draw_core(const lv_area_t * coords, const lv_area_t * mas
         lv_coord_t width = lv_area_get_width(&mask_com);
 
 #if LV_COMPILER_VLA_SUPPORTED
-        uint8_t buf[(lv_area_get_width(&mask_com) * (LV_COLOR_SIZE + 1))];
+        uint8_t buf[(lv_area_get_width(&mask_com) * ((LV_COLOR_DEPTH >> 3) + 1))];
 #else
         uint8_t buf[LV_HOR_RES * ((LV_COLOR_DEPTH >> 3) + 1)];  /*+1 because of the possible alpha byte*/
 #endif
diff --git a/lv_misc/lv_ll.c b/lv_misc/lv_ll.c
index d12de91f1..580beb1da 100644
--- a/lv_misc/lv_ll.c
+++ b/lv_misc/lv_ll.c
@@ -157,7 +157,7 @@ void * lv_ll_ins_tail(lv_ll_t * ll_p)
 
 /**
  * Remove the node 'node_p' from 'll_p' linked list.
- * It Dose not free the the memory of node.
+ * It dose not free the the memory of node.
  * @param ll_p pointer to the linked list of 'node_p'
  * @param node_p pointer to node in 'll_p' linked list
  */
@@ -321,7 +321,10 @@ void lv_ll_move_before(lv_ll_t * ll_p, void * n_act, void * n_after)
     if(n_act == n_after) return;    /*Can't move before itself*/
 
 
-    void * n_before = lv_ll_get_prev(ll_p, n_after);
+    void * n_before;
+    if(n_after != NULL) n_before = lv_ll_get_prev(ll_p, n_after);
+    else n_before = lv_ll_get_tail(ll_p);        /*if `n_after` is NULL `n_act` should be the new tail*/
+
     if(n_act == n_before) return;   /*Already before `n_after`*/
 
     /*It's much easier to remove from the list and add again*/
diff --git a/lv_misc/lv_ll.h b/lv_misc/lv_ll.h
index 43f865182..5960132db 100644
--- a/lv_misc/lv_ll.h
+++ b/lv_misc/lv_ll.h
@@ -72,7 +72,7 @@ void * lv_ll_ins_tail(lv_ll_t * ll_p);
 
 /**
  * Remove the node 'node_p' from 'll_p' linked list.
- * It Dose not free the the memory of node.
+ * It dose not free the the memory of node.
  * @param ll_p pointer to the linked list of 'node_p'
  * @param node_p pointer to node in 'll_p' linked list
  */
diff --git a/lv_misc/lv_task.c b/lv_misc/lv_task.c
index c2a9a48b6..160e066bc 100644
--- a/lv_misc/lv_task.c
+++ b/lv_misc/lv_task.c
@@ -32,6 +32,8 @@ static lv_ll_t lv_task_ll;  /*Linked list to store the lv_tasks*/
 static bool lv_task_run = false;
 static uint8_t idle_last = 0;
 static bool task_deleted;
+static bool task_created;
+static lv_task_t  * task_act;
 
 /**********************
  *      MACROS
@@ -80,33 +82,35 @@ LV_ATTRIBUTE_TASK_HANDLER void lv_task_handler(void)
     bool end_flag;
     do {
         end_flag = true;
-        lv_task_t * act = lv_ll_get_head(&lv_task_ll);
-        while(act) {
+        task_deleted = false;
+        task_created = false;
+        task_act = lv_ll_get_head(&lv_task_ll);
+        while(task_act) {
             /* The task might be deleted if it runs only once ('once = 1')
              * So get next element until the current is surely valid*/
-            next = lv_ll_get_next(&lv_task_ll, act);
+            next = lv_ll_get_next(&lv_task_ll, task_act);
 
             /*We reach priority of the turned off task. There is nothing more to do.*/
-            if(act->prio == LV_TASK_PRIO_OFF) {
+            if(task_act->prio == LV_TASK_PRIO_OFF) {
                 break;
             }
 
             /*Here is the interrupter task. Don't execute it again.*/
-            if(act == task_interrupter) {
+            if(task_act == task_interrupter) {
                 task_interrupter = NULL;     /*From this point only task after the interrupter comes, so the interrupter is not interesting anymore*/
-                act = next;
+                task_act = next;
                 continue;                   /*Load the next task*/
             }
 
             /*Just try to run the tasks with highest priority.*/
-            if(act->prio == LV_TASK_PRIO_HIGHEST) {
-                lv_task_exec(act);
+            if(task_act->prio == LV_TASK_PRIO_HIGHEST) {
+                lv_task_exec(task_act);
             }
             /*Tasks with higher priority then the interrupted shall be run in every case*/
             else if(task_interrupter) {
-                if(act->prio > task_interrupter->prio) {
-                    if(lv_task_exec(act)) {
-                        task_interrupter = act;  /*Check all tasks again from the highest priority */
+                if(task_act->prio > task_interrupter->prio) {
+                    if(lv_task_exec(task_act)) {
+                        task_interrupter = task_act;  /*Check all tasks again from the highest priority */
                         end_flag = false;
                         break;
                     }
@@ -115,13 +119,17 @@ LV_ATTRIBUTE_TASK_HANDLER void lv_task_handler(void)
             /* It is no interrupter task or we already reached it earlier.
              * Just run the remaining tasks*/
             else {
-                if(lv_task_exec(act)) {
-                    task_interrupter = act;  /*Check all tasks again from the highest priority */
+                if(lv_task_exec(task_act)) {
+                    task_interrupter = task_act;  /*Check all tasks again from the highest priority */
                     end_flag = false;
                     break;
                 }
             }
-            act = next;         /*Load the next task*/
+
+            if(task_deleted) break;     /*If a task was deleted then this or the next item might be corrupted*/
+            if(task_created) break;     /*If a task was deleted then this or the next item might be corrupted*/
+
+            task_act = next;         /*Load the next task*/
         }
     } while(!end_flag);
 
@@ -186,6 +194,8 @@ lv_task_t * lv_task_create(void (*task)(void *), uint32_t period, lv_task_prio_t
     new_lv_task->once = 0;
     new_lv_task->last_run = lv_tick_get();
 
+    task_created = true;
+
     return new_lv_task;
 }
 
@@ -199,7 +209,7 @@ void lv_task_del(lv_task_t * lv_task_p)
 
     lv_mem_free(lv_task_p);
 
-    task_deleted = true;
+    if(task_act == lv_task_p) task_deleted = true;      /*The active task was deleted*/
 }
 
 /**
@@ -301,12 +311,15 @@ static bool lv_task_exec(lv_task_t * lv_task_p)
     uint32_t elp = lv_tick_elaps(lv_task_p->last_run);
     if(elp >= lv_task_p->period) {
         lv_task_p->last_run = lv_tick_get();
-        task_deleted  = false;
+        task_deleted = false;
+        task_created = false;
         lv_task_p->task(lv_task_p->param);
 
         /*Delete if it was a one shot lv_task*/
         if(task_deleted == false) {			/*The task might be deleted by itself as well*/
-        	if(lv_task_p->once != 0) lv_task_del(lv_task_p);
+        	if(lv_task_p->once != 0) {
+        	    lv_task_del(lv_task_p);
+        	}
         }
         exec = true;
     }
diff --git a/lv_objx/lv_ta.h b/lv_objx/lv_ta.h
index b97c67c49..284dcacec 100644
--- a/lv_objx/lv_ta.h
+++ b/lv_objx/lv_ta.h
@@ -49,7 +49,7 @@ enum {
     LV_CURSOR_BLOCK,
     LV_CURSOR_OUTLINE,
     LV_CURSOR_UNDERLINE,
-    LV_CURSOR_HIDDEN = 0x10,    /*Or it to any value to hide the cursor temporally*/
+    LV_CURSOR_HIDDEN = 0x08,    /*Or it to any value to hide the cursor temporally*/
 };
 typedef uint8_t lv_cursor_type_t;
 
@@ -68,7 +68,7 @@ typedef struct
         lv_style_t *style;      /*Style of the cursor (NULL to use label's style)*/
         lv_coord_t valid_x;         /*Used when stepping up/down in text area when stepping to a shorter line. (Handled by the library)*/
         uint16_t pos;           /*The current cursor position (0: before 1. letter; 1: before 2. letter etc.)*/
-        lv_cursor_type_t type:3;  /*Shape of the cursor*/
+        lv_cursor_type_t type:4;  /*Shape of the cursor*/
         uint8_t state :1;       /*Indicates that the cursor is visible now or not (Handled by the library)*/
     } cursor;
 } lv_ta_ext_t;
diff --git a/lv_objx/lv_tabview.c b/lv_objx/lv_tabview.c
index 28aa76714..1988d3600 100644
--- a/lv_objx/lv_tabview.c
+++ b/lv_objx/lv_tabview.c
@@ -275,8 +275,10 @@ void lv_tabview_set_tab_act(lv_obj_t * tabview, uint16_t id, bool anim_en)
 
     lv_style_t * style = lv_obj_get_style(ext->content);
 
+    lv_res_t res = LV_RES_OK;
     if(id >= ext->tab_cnt) id = ext->tab_cnt - 1;
-    if(ext->tab_load_action && id != ext->tab_cur) ext->tab_load_action(tabview, id);
+    if(ext->tab_load_action && id != ext->tab_cur) res = ext->tab_load_action(tabview, id);
+    if(res != LV_RES_OK) return;        /*Prevent the tab loading*/
 
     ext->tab_cur = id;
 
diff --git a/lv_objx/lv_tabview.h b/lv_objx/lv_tabview.h
index 0356f39c4..3c80ff346 100644
--- a/lv_objx/lv_tabview.h
+++ b/lv_objx/lv_tabview.h
@@ -42,8 +42,9 @@ extern "C" {
  *      TYPEDEFS
  **********************/
 
-/* parametes: pointer to a tabview object, tab_id*/
-typedef void (*lv_tabview_action_t)(lv_obj_t *, uint16_t);
+/* parametes: pointer to a tabview object, tab_id
+ * return: LV_RES_INV: to prevent the loading of the tab;  LV_RES_OK: if everything is fine*/
+typedef lv_res_t (*lv_tabview_action_t)(lv_obj_t *, uint16_t);
 
 
 enum {