diff --git a/src/main/resources/de/prob2/jupyter/kernelspecfiles/kernel.js b/src/main/resources/de/prob2/jupyter/kernelspecfiles/kernel.js
index d771df0817024262e1dc6abf4bf74e1f75499f43..af3e75253aaf823858590463f258a329b6e32b74 100644
--- a/src/main/resources/de/prob2/jupyter/kernelspecfiles/kernel.js
+++ b/src/main/resources/de/prob2/jupyter/kernelspecfiles/kernel.js
@@ -195,7 +195,7 @@ define([
 											return "variable";
 										}
 									} else {
-										stream.match(/^.+/);
+										stream.match(/^./);
 										return "error";
 									}
 								}