1 files changed, 2 insertions, 1 deletions
diff --git a/src/scheduler.cpp b/src/scheduler.cpp
index 36a6d5110d..4edb2c6d9b 100644
--- a/src/scheduler.cpp
+++ b/src/scheduler.cpp
@@ -141,6 +141,7 @@ size_t CScheduler::getQueueInfo(boost::chrono::system_clock::time_point &first,
 }
 
 bool CScheduler::AreThreadsServicingQueue() const {
+    boost::unique_lock<boost::mutex> lock(newTaskMutex);
     return nThreadsServicingQueue;
 }
 
@@ -173,7 +174,7 @@ void SingleThreadedSchedulerClient::ProcessQueue() {
     // to ensure both happen safely even if callback() throws.
     struct RAIICallbacksRunning {
         SingleThreadedSchedulerClient* instance;
-        RAIICallbacksRunning(SingleThreadedSchedulerClient* _instance) : instance(_instance) {}
+        explicit RAIICallbacksRunning(SingleThreadedSchedulerClient* _instance) : instance(_instance) {}
         ~RAIICallbacksRunning() {
             {
                 LOCK(instance->m_cs_callbacks_pending);