diff --git a/sw/UITest_sw_ui_frmdlg.mk b/sw/UITest_sw_ui_frmdlg.mk
index 0fae8bf25f1d..219a72ddfae3 100644
--- a/sw/UITest_sw_ui_frmdlg.mk
+++ b/sw/UITest_sw_ui_frmdlg.mk
@@ -15,4 +15,6 @@ $(eval $(call gb_UITest_set_defs,sw_ui_frmdlg, \
     TDOC="$(SRCDIR)/sw/qa/uitest/data" \
 ))
 
+$(eval $(call gb_UITest_avoid_oneprocess,sw_ui_frmdlg))
+
 # vim: set noet sw=4 ts=4:
diff --git a/sw/qa/uitest/ui/frmdlg/frmdlg.py b/sw/qa/uitest/ui/frmdlg/frmdlg.py
index e3aeb67c569c..e30b67ff5313 100644
--- a/sw/qa/uitest/ui/frmdlg/frmdlg.py
+++ b/sw/qa/uitest/ui/frmdlg/frmdlg.py
@@ -62,4 +62,22 @@ class Test(UITestCase):
                 # and floating tables.
                 self.assertEqual(get_state_as_dict(xFlysplit)['Visible'], "false")
 
+    def test_insert_frame_dialog(self):
+        # Change from inch to cm to hit the rounding error. 2 means Centimeter, see
+        # officecfg/registry/schema/org/openoffice/Office/Writer.xcs.
+        with self.ui_test.set_config('/org.openoffice.Office.Writer/Layout/Other/MeasureUnit', 2):
+            # Given a Writer document:
+            with self.ui_test.create_doc_in_start_center("writer") as xComponent:
+                # When inserting a new frame with the default width:
+                with self.ui_test.execute_dialog_through_command(".uno:InsertFrame") as xDialog:
+                    xWidth = xDialog.getChild("width")
+                    frame_width = float(get_state_as_dict(xWidth)["Value"])
+                # Then make sure the width is not zero:
+                # cm -> mm100
+                expected_mm100 = frame_width * 1000
+                # Without the accompanying fix in place, this test would have failed with:
+                # AssertionError: 0 != 2000.0
+                # i.e. the width was empty instead of the size from the UI.
+                self.assertEqual(xComponent.TextFrames.Frame1.Size.Width, expected_mm100)
+
 # vim: set shiftwidth=4 softtabstop=4 expandtab:
diff --git a/sw/source/ui/frmdlg/frmpage.cxx b/sw/source/ui/frmdlg/frmpage.cxx
index 352dc15df463..b38ac22d0d11 100644
--- a/sw/source/ui/frmdlg/frmpage.cxx
+++ b/sw/source/ui/frmdlg/frmpage.cxx
@@ -1264,7 +1264,13 @@ bool SwFramePage::FillItemSet(SfxItemSet *rSet)
 
     pOldItem = GetOldItem(*rSet, RES_FRM_SIZE);
 
-    if ((pOldItem && aSz != *pOldItem) || (!pOldItem && !m_bFormat) ||
+    bool bSizeChanged = pOldItem && aSz != *pOldItem;
+    if (!bSizeChanged && m_bNew)
+    {
+        // If no custom size is provided, always set a size for a new frame, to avoid ~zero width.
+        bSizeChanged = true;
+    }
+    if (bSizeChanged || (!pOldItem && !m_bFormat) ||
             (m_bFormat &&
                 (aSz.GetWidth() > 0 || aSz.GetWidthPercent() > 0) &&
                     (aSz.GetHeight() > 0 || aSz.GetHeightPercent() > 0)))