diff --git a/src/plugins/qbsprojectmanager/qbsbuildstep.cpp b/src/plugins/qbsprojectmanager/qbsbuildstep.cpp
index 10f6294aee5..9de04c14684 100644
--- a/src/plugins/qbsprojectmanager/qbsbuildstep.cpp
+++ b/src/plugins/qbsprojectmanager/qbsbuildstep.cpp
@@ -76,8 +76,10 @@ QbsBuildStep::QbsBuildStep(ProjectExplorer::BuildStepList *bsl, const QbsBuildSt
 QbsBuildStep::~QbsBuildStep()
 {
     cancel();
-    m_job->deleteLater();
-    m_job = 0;
+    if (m_job) {
+        m_job->deleteLater();
+        m_job = 0;
+    }
     delete m_parser;
 }
 
diff --git a/src/plugins/qbsprojectmanager/qbscleanstep.cpp b/src/plugins/qbsprojectmanager/qbscleanstep.cpp
index 2611537ce32..042bf316db8 100644
--- a/src/plugins/qbsprojectmanager/qbscleanstep.cpp
+++ b/src/plugins/qbsprojectmanager/qbscleanstep.cpp
@@ -72,8 +72,10 @@ QbsCleanStep::QbsCleanStep(ProjectExplorer::BuildStepList *bsl, const QbsCleanSt
 QbsCleanStep::~QbsCleanStep()
 {
     cancel();
-    m_job->deleteLater();
-    m_job = 0;
+    if (m_job) {
+        m_job->deleteLater();
+        m_job = 0;
+    }
 }
 
 bool QbsCleanStep::init()