diff --git a/packages/mermaid/src/diagrams/block/blockDB.ts b/packages/mermaid/src/diagrams/block/blockDB.ts
index a3ef97e24..3cc9ec11d 100644
--- a/packages/mermaid/src/diagrams/block/blockDB.ts
+++ b/packages/mermaid/src/diagrams/block/blockDB.ts
@@ -22,8 +22,7 @@ const populateBlockDatabase = (blockList: Block[], parent: Block): void => {
   const children = [];
   for (const block of blockList) {
     if (block.type === 'column-setting') {
-      const columns = block.columns || -1;
-      parent.columns = columns;
+      parent.columns = block.columns || -1;
     } else {
       if (!block.label) {
         if (block.type === 'composite') {
@@ -39,7 +38,8 @@ const populateBlockDatabase = (blockList: Block[], parent: Block): void => {
       }
 
       if (block.type === 'space') {
-        for (let j = 0; j < block.width; j++) {
+        const w = block.width || 1;
+        for (let j = 0; j < w; j++) {
           const newBlock = clone(block);
           newBlock.id = newBlock.id + '-' + j;
           blockDatabase[newBlock.id] = newBlock;
diff --git a/packages/mermaid/src/diagrams/block/blockTypes.ts b/packages/mermaid/src/diagrams/block/blockTypes.ts
index 001cd7bda..a65e5db32 100644
--- a/packages/mermaid/src/diagrams/block/blockTypes.ts
+++ b/packages/mermaid/src/diagrams/block/blockTypes.ts
@@ -17,6 +17,7 @@ export type BlockType =
   | 'lean_left'
   | 'trapezoid'
   | 'inv_trapezoid'
+  | 'rect_left_inv_arrow'
   | 'odd_right'
   | 'circle'
   | 'ellipse'
@@ -28,6 +29,7 @@ export type BlockType =
   | 'composite';
 
 export interface Block {
+  width?: number;
   id: string;
   label?: string;
   parent?: Block;