diff --git a/mitmproxy/dump.py b/mitmproxy/dump.py
index b95d2627a..18c24d617 100644
--- a/mitmproxy/dump.py
+++ b/mitmproxy/dump.py
@@ -45,6 +45,7 @@ class DumpMaster(flow.FlowMaster):
 
     def __init__(self, server, options):
         flow.FlowMaster.__init__(self, options, server, flow.State())
+        self.has_errored = False
         self.addons.add(*builtins.default_addons())
         # This line is just for type hinting
         self.options = self.options  # type: Options
@@ -115,6 +116,8 @@ class DumpMaster(flow.FlowMaster):
             raise DumpError(str(e))
 
     def add_log(self, e, level="info"):
+        if level == "error":
+            self.has_errored = True
         if self.options.verbosity >= utils.log_tier(level):
             self.echo(
                 e,
diff --git a/mitmproxy/main.py b/mitmproxy/main.py
index 5ced709b9..316db91a8 100644
--- a/mitmproxy/main.py
+++ b/mitmproxy/main.py
@@ -118,6 +118,9 @@ def mitmdump(args=None):  # pragma: no cover
         sys.exit(1)
     except (KeyboardInterrupt, _thread.error):
         pass
+    if master.has_errored:
+        print("mitmdump: errors occurred during run", file=sys.stderr)
+        sys.exit(1)
 
 
 def mitmweb(args=None):  # pragma: no cover