diff --git a/src/server/distrend.c b/src/server/distrend.c
--- a/src/server/distrend.c
+++ b/src/server/distrend.c
@@ -446,6 +446,8 @@ int interactiveTest(int test, struct gen
        fprintf(stderr, "Got frame: ");
        if(find_jobframe(conn, slaveKey, &jobKey, &frameNum))
          fprintf(stderr,"No frames available to render!\n");
+       else if(jobKey == -1)
+         fprintf(stderr,"Slave &d has no render power!", slaveKey);
        else
          fprintf(stderr, "jobKey: %d, frameNum: %d\n",jobKey,frameNum);
        break;