2 files changed, 5 insertions, 1 deletions
diff --git a/src/quick/items/qquicktext.cpp b/src/quick/items/qquicktext.cpp
index dd4f57bfdb..205571f2e7 100644
--- a/src/quick/items/qquicktext.cpp
+++ b/src/quick/items/qquicktext.cpp
@@ -91,6 +91,7 @@ QQuickTextPrivate::ExtraData::ExtraData()
     , minimumPointSize(12)
     , nbActiveDownloads(0)
     , maximumLineCount(INT_MAX)
+    , lineHeightValid(false)
     , lineHeightMode(QQuickText::ProportionalHeight)
     , fontSizeMode(QQuickText::FixedSize)
 {
@@ -344,7 +345,7 @@ void QQuickTextPrivate::updateLayout()
             }
             textHasChanged = false;
         }
-    } else {
+    } else if (extra.isAllocated() && extra->lineHeightValid) {
         ensureDoc();
         QTextBlockFormat::LineHeightTypes type;
         type = lineHeightMode() == QQuickText::FixedHeight ? QTextBlockFormat::FixedHeight : QTextBlockFormat::ProportionalHeight;
@@ -2386,6 +2387,7 @@ void QQuickText::setLineHeight(qreal lineHeight)
     if ((d->lineHeight() == lineHeight) || (lineHeight < 0.0))
         return;
 
+    d->extra.value().lineHeightValid = true;
     d->extra.value().lineHeight = lineHeight;
     d->implicitHeightValid = false;
     d->updateLayout();
@@ -2417,6 +2419,7 @@ void QQuickText::setLineHeightMode(LineHeightMode mode)
         return;
 
     d->implicitHeightValid = false;
+    d->extra.value().lineHeightValid = true;
     d->extra.value().lineHeightMode = mode;
     d->updateLayout();
 
diff --git a/src/quick/items/qquicktext_p_p.h b/src/quick/items/qquicktext_p_p.h
index 9a6da3736e..cd14008728 100644
--- a/src/quick/items/qquicktext_p_p.h
+++ b/src/quick/items/qquicktext_p_p.h
@@ -95,6 +95,7 @@ public:
         int minimumPointSize;
         int nbActiveDownloads;
         int maximumLineCount;
+        bool lineHeightValid : 1;
         QQuickText::LineHeightMode lineHeightMode;
         QQuickText::FontSizeMode fontSizeMode;
         QList<QQuickStyledTextImgTag*> imgTags;