diff --git a/src/vmime/net/imap/IMAPFolder.cpp b/src/vmime/net/imap/IMAPFolder.cpp
index 343ec35e..3af9225a 100644
--- a/src/vmime/net/imap/IMAPFolder.cpp
+++ b/src/vmime/net/imap/IMAPFolder.cpp
@@ -1124,7 +1124,7 @@ messageSet IMAPFolder::addMessage
 	const IMAPParser::resp_text_code* respTextCode =
 		finalResp->response_done()->response_tagged()->resp_cond_state()->resp_text()->resp_text_code();
 
-	if (respTextCode->type() == IMAPParser::resp_text_code::APPENDUID)
+	if (respTextCode && respTextCode->type() == IMAPParser::resp_text_code::APPENDUID)
 		return IMAPUtils::buildMessageSet(respTextCode->uid_set());
 
 	return messageSet::empty();
@@ -1266,7 +1266,7 @@ messageSet IMAPFolder::copyMessages(const folder::path& dest, const messageSet&
 	const IMAPParser::resp_text_code* respTextCode =
 		resp->response_done()->response_tagged()->resp_cond_state()->resp_text()->resp_text_code();
 
-	if (respTextCode->type() == IMAPParser::resp_text_code::COPYUID)
+	if (respTextCode && respTextCode->type() == IMAPParser::resp_text_code::COPYUID)
 		return IMAPUtils::buildMessageSet(respTextCode->uid_set2());
 
 	return messageSet::empty();