diff --git a/LayoutTests/fast/dom/focus-dialog-blur-input-type-change-crash-expected.txt b/LayoutTests/fast/dom/focus-dialog-blur-input-type-change-crash-expected.txt
new file mode 100644
index 000000000000..7ef22e9a431a
--- /dev/null
+++ b/LayoutTests/fast/dom/focus-dialog-blur-input-type-change-crash-expected.txt
@@ -0,0 +1 @@
+PASS
diff --git a/LayoutTests/fast/dom/focus-dialog-blur-input-type-change-crash.html b/LayoutTests/fast/dom/focus-dialog-blur-input-type-change-crash.html
new file mode 100644
index 000000000000..252e939ebc92
--- /dev/null
+++ b/LayoutTests/fast/dom/focus-dialog-blur-input-type-change-crash.html
@@ -0,0 +1,21 @@
+<script>
+if (window.testRunner)
+    testRunner.dumpAsText();
+
+function main() {
+    input.focus();
+    input.stepUp(1);
+    document.body.innerHTML = 'PASS';
+}
+function inputFocus() {
+    x1.show();
+}
+function dialogChange() {
+    x1.close();
+    input.type = "range";
+}
+</script>
+<body onload="main()">
+<dialog id="x1" tabindex="0" onfocus="dialogChange()" onblur="dialogChange()">
+</dialog>
+<input id="input" onfocusin="inputFocus()" type="time">
diff --git a/Source/WebCore/dom/Document.cpp b/Source/WebCore/dom/Document.cpp
index d66a69bb8714..8c144a008390 100644
--- a/Source/WebCore/dom/Document.cpp
+++ b/Source/WebCore/dom/Document.cpp
@@ -4845,7 +4845,7 @@ bool Document::setFocusedElement(Element* element, const FocusOptions& options)
     }
 
     auto isNewElementFocusable = [&] {
-        if (!newFocusedElement)
+        if (!newFocusedElement || !newFocusedElement->isConnected())
             return false;
         // Resolving isFocusable() may require matching :focus-within as if the focus was already on the new element.
         newFocusedElement->setHasTentativeFocus(true);
