diff --git a/src/config/parse_config.h b/src/config/parse_config.h
index 2497661..45c1616 100644
--- a/src/config/parse_config.h
+++ b/src/config/parse_config.h
@@ -2276,6 +2276,17 @@ bool parse_option(Config *config, char *key, char *value) {
 		binding->arg.v = NULL;
 		binding->arg.v2 = NULL;
 		binding->arg.v3 = NULL;
+
+		// TODO: remove this in next version
+		if (binding->mod == 0 &&
+			(binding->button == BTN_LEFT || binding->button == BTN_RIGHT)) {
+			fprintf(stderr,
+					"\033[1m\033[31m[ERROR]:\033[33m \033[31m%s\033[33m can't "
+					"bind to \033[31m%s\033[33m mod key\n",
+					button_str, mod_str);
+			return false;
+		}
+
 		binding->func =
 			parse_func_name(func_name, &binding->arg, arg_value, arg_value2,
 							arg_value3, arg_value4, arg_value5);
@@ -2293,6 +2304,7 @@ bool parse_option(Config *config, char *key, char *value) {
 				free(binding->arg.v3);
 				binding->arg.v3 = NULL;
 			}
+
 			if (!binding->func)
 				fprintf(stderr,
 						"\033[1m\033[31m[ERROR]:\033[33m Unknown "