check if envp is NULL

Author: ideal

src/task.c

@@ -178,9 +178,11 @@ int task_close(task_t *task)
     }
     free(task->args);
 
-    ptr = task->envp;
-    while (*ptr) {
-        free(*ptr++);
+    if (task->envp) {
+        ptr = task->envp;
+        while (*ptr) {
+            free(*ptr++);
+        }
     }
     // ok if envp is NULL
     free(task->envp);