diff --git a/GUI/Model/Job/JobItem.cpp b/GUI/Model/Job/JobItem.cpp
index 01ed04aa824370bda03c805a2f0a46c67bf8c369..23f593d254c6cf7ecba7fe08c6c162f93a8a938f 100644
--- a/GUI/Model/Job/JobItem.cpp
+++ b/GUI/Model/Job/JobItem.cpp
@@ -350,20 +350,16 @@ void JobItem::importMasksFromDatafileItem()
 void JobItem::convertMaskCoords()
 {
     // TODO add projections
-    const MaskContainerItem* container = m_realItem->data2DItem()->maskContainerItem();
-    if (!container)
-        return;
-
     const Datafield* dfield = m_realItem->data2DItem()->c_field();
     ASSERT(dfield);
-
     MaskUnitsConverter mask_converter(dfield->frame());
 
     // Masks conversion can be done in two steps: first from original coords to bins,
     // then from bins to target coords.
     // If 'IDetector::addBinMask' is used by detector, only "orig coords --> bins" is needed.
-    for (auto* maskItem : container->maskItems())
-        mask_converter.convertToNbins(maskItem);
+    if (const auto* container = m_realItem->data2DItem()->maskContainerItem())
+        for (auto* maskItem : container->maskItems())
+            mask_converter.convertToNbins(maskItem);
 }
 
 //! Crops DatafileItem to the region of interest.