diff --git a/src/main.rs b/src/main.rs
index 1b56f2d..a91062d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -132,6 +132,10 @@ fn ps_aux() -> Option<String> {
             return None;
         },
     };
+    if !output.status.success() {
+        print_error(&format!("Run 'ps aux' error: {:?}", output.status));
+        return None;
+    }
     match String::from_utf8(output.stdout) {
         Ok(output_str) => Some(output_str),
         Err(err) => {