1 files changed, 5 insertions, 0 deletions

diff --git a/src/tools/parser.cpp b/src/tools/parser.cpp
index aa9e3e4..7d35f12 100644
--- a/src/tools/parser.cpp
+++ b/src/tools/parser.cpp
@@ -227,6 +227,11 @@ void redPrint( Bu::Parser &p )
 
 int main( int argc, char *argv[] )
 {
+        if( argc < 2 )
+        {
+                println("Provide an input filename as the first parameter.");
+                return 0;
+        }
         File fIn( argv[1], File::Read );
 
         Parser p;