LanguageClient: fix crash on completion assist cancel

The Client might be already deleted when the text editor codeassist
calls cancel on the processor.

Change-Id: I6b0b484a086456ed9d0543f530aea0fae32c523a
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/plugins/languageclient/languageclientcompletionassist.cpp b/src/plugins/languageclient/languageclientcompletionassist.cpp
index 3eec6cbbd9..bce818f96a 100644
--- a/src/plugins/languageclient/languageclientcompletionassist.cpp
+++ b/src/plugins/languageclient/languageclientcompletionassist.cpp
@@ -392,8 +392,10 @@ bool LanguageClientCompletionAssistProcessor::running()
 void LanguageClientCompletionAssistProcessor::cancel()
 {
     if (m_currentRequest.has_value()) {
-        m_client->cancelRequest(m_currentRequest.value());
-        m_client->removeAssistProcessor(this);
+        if (m_client) {
+            m_client->cancelRequest(m_currentRequest.value());
+            m_client->removeAssistProcessor(this);
+        }
         m_currentRequest.reset();
     } else if (m_postponedUpdateConnection) {
         QObject::disconnect(m_postponedUpdateConnection);