diff --git a/du6/program.c b/du6/program.c
index 7dbc15c..dd14d64 100644
--- a/du6/program.c
+++ b/du6/program.c
@@ -58,6 +58,17 @@ Tree* read_tree() {
         return NULL;
     }
 
+    // kontrola prebytocnych potomkov
+    long pos = ftell(stdin);
+
+    if (fgets(buffer, SIZE, stdin)) {
+    	// ak sa nacitalo ine nez prazdny riadok → chyba
+    	if (strcmp(buffer, "\n") != 0) {
+        	valid_db = 0;
+    	}
+    	fseek(stdin, pos, SEEK_SET);
+    }
+
     return node;
 }