diff --git a/ex04/src/main.cpp b/ex04/src/main.cpp
index 36dd0e9..58acb72 100644
--- a/ex04/src/main.cpp
+++ b/ex04/src/main.cpp
@@ -6,7 +6,7 @@
 /*   By: whaffman <whaffman@student.codam.nl>         +#+                     */
 /*                                                   +#+                      */
 /*   Created: 2025/03/23 13:59:46 by whaffman      #+#    #+#                 */
-/*   Updated: 2025/04/02 11:20:09 by whaffman      ########   odam.nl         */
+/*   Updated: 2025/04/03 14:44:17 by whaffman      ########   odam.nl         */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -36,6 +36,14 @@ int main(int argc, char *argv[])
         return 1;
     }
 
+    if (argv[2][0] == '\0')
+    {
+        std::cout << "Old String shouldn't be empty" << std::endl;
+        inFile.close();
+        outFile.close();
+        return 1;
+    }
+
     outFileName = argv[1];
     outFileName += ".replace";
     outFile.open(outFileName, std::ios::out);
@@ -45,6 +53,7 @@ int main(int argc, char *argv[])
         inFile.close();
         return 1;
     }
+
     Replacer replacer(argv[2], argv[3]);
 
     while (std::getline(inFile, line))