diff --git a/3rdparty/singleapplication/singleapplication_p.cpp b/3rdparty/singleapplication/singleapplication_p.cpp
index c1bdff472..de4945e5d 100644
--- a/3rdparty/singleapplication/singleapplication_p.cpp
+++ b/3rdparty/singleapplication/singleapplication_p.cpp
@@ -55,6 +55,8 @@ SingleApplicationPrivate::SingleApplicationPrivate( SingleApplication *q_ptr )
 {
     server = nullptr;
     socket = nullptr;
+    memory = nullptr;
+    instanceNumber = -1;
 }
 
 SingleApplicationPrivate::~SingleApplicationPrivate()
diff --git a/3rdparty/singleapplication/singlecoreapplication_p.cpp b/3rdparty/singleapplication/singlecoreapplication_p.cpp
index e3c54cc5c..20de2ef24 100644
--- a/3rdparty/singleapplication/singlecoreapplication_p.cpp
+++ b/3rdparty/singleapplication/singlecoreapplication_p.cpp
@@ -55,6 +55,8 @@ SingleCoreApplicationPrivate::SingleCoreApplicationPrivate( SingleCoreApplicatio
 {
     server = nullptr;
     socket = nullptr;
+    memory = nullptr;
+    instanceNumber = -1;
 }
 
 SingleCoreApplicationPrivate::~SingleCoreApplicationPrivate()