diff --git a/du3/program.c b/du3/program.c
index 609a31a..1a7deac 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -57,8 +57,12 @@ int main()
 
     while (fgets(line, SIZE, stdin) != NULL)
     {
-        if (sscanf(line, "%127[^\n]", strBuffer))
-        {
+            (sscanf(line, "%127[^\n]", strBuffer);
+            if (strBuffer[0] == '\0')
+            {
+                printf("CHYBA\n");
+                continue;
+            }
             bool isLineInvalid = false;
             //docasne 'char' premeny
             char num1Temp[TEMPBUFFERSIZE], num2Temp[TEMPBUFFERSIZE], resultTemp[TEMPBUFFERSIZE];
@@ -154,7 +158,6 @@ int main()
             {
                 printf("OK\n");
             }
-        }
     }
     return 0;
 }