diff --git a/app/cli-acx/src/main/java/io/github/applecommander/acx/PrintExceptionMessageHandler.java b/app/cli-acx/src/main/java/io/github/applecommander/acx/PrintExceptionMessageHandler.java
index cbd824d..d23831a 100644
--- a/app/cli-acx/src/main/java/io/github/applecommander/acx/PrintExceptionMessageHandler.java
+++ b/app/cli-acx/src/main/java/io/github/applecommander/acx/PrintExceptionMessageHandler.java
@@ -14,8 +14,8 @@ public class PrintExceptionMessageHandler implements IExecutionExceptionHandler
             ex.printStackTrace(System.err);
         }
         else {
-            // bold red error message
-            cmd.getErr().println(cmd.getColorScheme().errorText(ex.getMessage()));
+            // bold red error message (+ "" is to handle null messages)
+            cmd.getErr().println(cmd.getColorScheme().errorText(ex.getMessage() + ""));
         }
 
         return cmd.getExitCodeExceptionMapper() != null