diff --git a/sw/qa/extras/ooxmlimport/data/fdo78939.docx b/sw/qa/extras/ooxmlimport/data/fdo78939.docx
new file mode 100644
index 000000000000..2fc3198630cd
Binary files /dev/null and b/sw/qa/extras/ooxmlimport/data/fdo78939.docx differ
diff --git a/sw/qa/extras/ooxmlimport/ooxmlimport.cxx b/sw/qa/extras/ooxmlimport/ooxmlimport.cxx
index ea1910ba20b0..1102c29a71da 100644
--- a/sw/qa/extras/ooxmlimport/ooxmlimport.cxx
+++ b/sw/qa/extras/ooxmlimport/ooxmlimport.cxx
@@ -2198,6 +2198,18 @@ DECLARE_OOXMLIMPORT_TEST(testGroupshapeTrackedchanges, "groupshape-trackedchange
     CPPUNIT_ASSERT_EQUAL(OUString(" Inserted"), xShape->getString());
 }
 
+DECLARE_OOXMLIMPORT_TEST(testFdo78939, "fdo78939.docx")
+{
+    // fdo#78939 : LO hanged while opening issue document
+
+    // Whenever a para-style was applied to a Numbering format level,
+    // LO incorrectly also changed the para-style..
+
+    // check that file opens and does not hang while opening and also
+    // check that an incorrect numbering style is not applied ...
+    CPPUNIT_ASSERT_EQUAL(OUString(), getProperty<OUString>(getParagraph(1), "NumberingStyleName"));
+}
+
 #endif
 
 CPPUNIT_PLUGIN_IMPLEMENT();
diff --git a/writerfilter/source/dmapper/NumberingManager.cxx b/writerfilter/source/dmapper/NumberingManager.cxx
index 65f6a669b321..66e9d65b4bc6 100644
--- a/writerfilter/source/dmapper/NumberingManager.cxx
+++ b/writerfilter/source/dmapper/NumberingManager.cxx
@@ -643,13 +643,6 @@ void ListDef::CreateNumberingRules( DomainMapper& rDMapper,
                 aLvlProps[sal::static_int_cast<sal_uInt32>(aLvlProps.getLength()) - 1] = MAKE_PROPVAL( PROP_POSITION_AND_SPACE_MODE,
                             sal_Int16( text::PositionAndSpaceMode::LABEL_ALIGNMENT ) );
 
-                StyleSheetEntryPtr pParaStyle = pAbsLevel->GetParaStyle( );
-                if( pParaStyle.get())
-                {
-                    aLvlProps.realloc( aLvlProps.getLength() + 1 );
-                    aLvlProps[sal::static_int_cast<sal_uInt32>(aLvlProps.getLength()) - 1] = MAKE_PROPVAL( PROP_PARAGRAPH_STYLE_NAME,
-                        pParaStyle->sConvertedStyleName );
-                }
 
                 // Replace the numbering rules for the level
                 m_xNumRules->replaceByIndex( nLevel, uno::makeAny( aLvlProps ) );
@@ -662,6 +655,7 @@ void ListDef::CreateNumberingRules( DomainMapper& rDMapper,
                     uno::Reference< container::XIndexReplace > xOutlineRules =
                         xOutlines->getChapterNumberingRules( );
 
+                    StyleSheetEntryPtr pParaStyle = pAbsLevel->GetParaStyle( );
                     aLvlProps.realloc( aLvlProps.getLength() + 1 );
                     aLvlProps[sal::static_int_cast<sal_uInt32>(aLvlProps.getLength()) - 1] = MAKE_PROPVAL( PROP_HEADING_STYLE_NAME,
                         pParaStyle->sConvertedStyleName );