diff --git a/src/vs/workbench/parts/debug/common/debugModel.ts b/src/vs/workbench/parts/debug/common/debugModel.ts
index 302890f4bb39ff301a1d6f9c32bef11e7c6cf012..08d757dd5805761f6cf4f6e891b6ed603e2ff2ed 100644
--- a/src/vs/workbench/parts/debug/common/debugModel.ts
+++ b/src/vs/workbench/parts/debug/common/debugModel.ts
@@ -863,7 +863,7 @@ export class Model implements debug.IModel {
 
 	public appendToRepl(output: string | debug.IExpression, severity: severity): void {
 		const previousOutput = this.replElements.length && (this.replElements[this.replElements.length - 1] as OutputElement);
-		if (previousOutput instanceof OutputElement && severity === previousOutput.severity && previousOutput.value === output && output.trim()) {
+		if (previousOutput instanceof OutputElement && severity === previousOutput.severity && previousOutput.value === output && output.trim() && output.length > 1) {
 			// we got the same output (but not an empty string when trimmed) so we just increment the counter
 			previousOutput.counter++;
 		} else {