diff --git a/ApplicationLibCode/ProjectDataModel/WellPath/RimFileWellPathDataLoader.cpp b/ApplicationLibCode/ProjectDataModel/WellPath/RimFileWellPathDataLoader.cpp
index d751ff4eb5..2f3e14b61b 100644
--- a/ApplicationLibCode/ProjectDataModel/WellPath/RimFileWellPathDataLoader.cpp
+++ b/ApplicationLibCode/ProjectDataModel/WellPath/RimFileWellPathDataLoader.cpp
@@ -45,7 +45,8 @@ void RimFileWellPathDataLoader::loadData( caf::PdmObject& pdmObject, const QStri
     auto* fWPath = dynamic_cast<RimFileWellPath*>( &pdmObject );
     if ( fWPath && !fWPath->filePath().isEmpty() )
     {
-        QString errorMessage;
+        QMutexLocker lock( &m_mutex );
+        QString      errorMessage;
         if ( !fWPath->readWellPathFile( &errorMessage, m_wellPathImporter.get(), false ) )
         {
             RiaLogging::warning( errorMessage );
diff --git a/ApplicationLibCode/ProjectDataModel/WellPath/RimFileWellPathDataLoader.h b/ApplicationLibCode/ProjectDataModel/WellPath/RimFileWellPathDataLoader.h
index 5f9b2a2b08..54cbe8ccba 100644
--- a/ApplicationLibCode/ProjectDataModel/WellPath/RimFileWellPathDataLoader.h
+++ b/ApplicationLibCode/ProjectDataModel/WellPath/RimFileWellPathDataLoader.h
@@ -23,6 +23,7 @@
 #include "cafDataLoader.h"
 #include "cafProgressInfo.h"
 
+#include <QMutex>
 #include <QString>
 
 #include <memory>
@@ -42,4 +43,5 @@ public:
 
 private:
     std::unique_ptr<RifWellPathImporter> m_wellPathImporter;
+    QMutex                               m_mutex;
 };