diff --git a/src/blocks/table-column/toolbar.tsx b/src/blocks/table-column/toolbar.tsx
index 3caaa4a..84c3c7c 100644
--- a/src/blocks/table-column/toolbar.tsx
+++ b/src/blocks/table-column/toolbar.tsx
@@ -307,6 +307,12 @@ export default function Toolbar( {
 				return false;
 			}
 
+			// Avoid merging thead/tfoot column with tbody column.
+			const currentRowContainerBlockAttributes = getBlockAttributes( currentRowContainerBlock.clientId );
+			if ( currentRowContainerBlockAttributes?.type !== rowContainerBlock?.attributes?.type ) {
+				return false;
+			}
+
 			return currentRowContainerBlock.innerBlocks.some( ( rowBlock, index ): boolean => {
 				// Get current row.
 				const rowNumber: number = index + 1;
@@ -369,6 +375,12 @@ export default function Toolbar( {
 				return false;
 			}
 
+			// Avoid merging thead/tfoot column with tbody column.
+			const currentRowContainerBlockAttributes = getBlockAttributes( currentRowContainerBlock.clientId );
+			if ( currentRowContainerBlockAttributes?.type !== rowContainerBlock?.attributes?.type ) {
+				return false;
+			}
+
 			return currentRowContainerBlock.innerBlocks.some( ( rowBlock, index ): boolean => {
 				// Get current row.
 				const rowNumber: number = index + 1;
@@ -435,6 +447,12 @@ export default function Toolbar( {
 				return false;
 			}
 
+			// Avoid merging thead/tfoot row with tbody row.
+			const currentRowContainerBlockAttributes = getBlockAttributes( currentRowContainerBlock.clientId );
+			if ( currentRowContainerBlockAttributes?.type !== rowContainerBlock?.attributes?.type ) {
+				return false;
+			}
+
 			return currentRowContainerBlock.innerBlocks.some( ( rowBlock, rowIndex ): boolean => {
 				// Get current row.
 				const rowNumber: number = rowIndex + 1;
@@ -497,6 +515,12 @@ export default function Toolbar( {
 				return false;
 			}
 
+			// Avoid merging thead/tfoot row with tbody row.
+			const currentRowContainerBlockAttributes = getBlockAttributes( currentRowContainerBlock.clientId );
+			if ( currentRowContainerBlockAttributes?.type !== rowContainerBlock?.attributes?.type ) {
+				return false;
+			}
+
 			return currentRowContainerBlock.innerBlocks.some( ( rowBlock, rowIndex ): boolean => {
 				// Get current row.
 				const rowNumber: number = rowIndex + 1;
@@ -547,6 +571,16 @@ export default function Toolbar( {
 		// Get colspans.
 		const mergeIntoAttributes = getBlockAttributes( toColumn.clientId );
 		const mergeFromAttributes = getBlockAttributes( fromColumn.clientId );
+
+		// Get rowspans.
+		const mergeIntoRowspan: number = parseInt( mergeIntoAttributes?.rowSpan ?? 1 );
+		const mergeFromRowspan: number = parseInt( mergeFromAttributes?.rowSpan ?? 1 );
+
+		// Invalid merge.
+		if ( mergeIntoRowspan !== mergeFromRowspan ) {
+			return;
+		}
+
 		const mergeIntoColspan: number = parseInt( mergeIntoAttributes?.colSpan ?? 1 );
 		const mergeFromColspan: number = parseInt( mergeFromAttributes?.colSpan ?? 1 );
 
@@ -574,6 +608,16 @@ export default function Toolbar( {
 		// Get rowspans.
 		const mergeIntoAttributes = getBlockAttributes( toColumn.clientId );
 		const mergeFromAttributes = getBlockAttributes( fromColumn.clientId );
+
+		// Get colspans.
+		const mergeIntoColspan: number = parseInt( mergeIntoAttributes?.colSpan ?? 1 );
+		const mergeFromColspan: number = parseInt( mergeFromAttributes?.colSpan ?? 1 );
+
+		// Invalid merge.
+		if ( mergeIntoColspan !== mergeFromColspan ) {
+			return;
+		}
+
 		const mergeIntoRowspan: number = parseInt( mergeIntoAttributes?.rowSpan ?? 1 );
 		const mergeFromRowspan: number = parseInt( mergeFromAttributes?.rowSpan ?? 1 );