diff --git a/du4/program.c b/du4/program.c
index 10e0b95..9c92661 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -16,6 +16,7 @@ int main(){
     bool equals = false;
 
     for(int i = 0; fgets(input, 100, stdin) != NULL; i++){
+        if(!input || !strcmp(input, "") || input[0] == EOF) break;
         counter = 0;
         operation = 0;
         equals = false;