diff --git a/src/Mod/Fem/PyGui/_CommandFemSolverRun.py b/src/Mod/Fem/PyGui/_CommandFemSolverRun.py
index de59c41956..4a5803d91d 100644
--- a/src/Mod/Fem/PyGui/_CommandFemSolverRun.py
+++ b/src/Mod/Fem/PyGui/_CommandFemSolverRun.py
@@ -82,6 +82,7 @@ class _CommandFemSolverRun(FemCommands):
                 machine.reset()
                 machine.target = femsolver.run.RESULTS
                 machine.start()
+                machine.join()  # wait for the machine to finish.
 
         FreeCADGui.Selection.clearSelection()