From 5a82a98663341bd0176c7d3779cc066a775e96f1 Mon Sep 17 00:00:00 2001
From: Marijn Haverbeke <marijn@haverbeke.nl>
Date: Tue, 25 Oct 2022 17:32:59 +0200
Subject: [PATCH] Don't assume nodeDOM returns non-null

FIX: Fix a crash when there's no DOM for the node next to the drag
position.

See https://discuss.prosemirror.net/t/dropcursor-bug-with-nodeviews/4977
---
 src/dropcursor.ts | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/dropcursor.ts b/src/dropcursor.ts
index 0a10486..30a9d5f 100644
--- a/src/dropcursor.ts
+++ b/src/dropcursor.ts
@@ -75,12 +75,14 @@ class DropCursorView {
     if (!$pos.parent.inlineContent) {
       let before = $pos.nodeBefore, after = $pos.nodeAfter
       if (before || after) {
-        let nodeRect = (this.editorView.nodeDOM(this.cursorPos! - (before ?  before.nodeSize : 0)) as HTMLElement)
-                         .getBoundingClientRect()
-        let top = before ? nodeRect.bottom : nodeRect.top
-        if (before && after)
-          top = (top + (this.editorView.nodeDOM(this.cursorPos!) as HTMLElement).getBoundingClientRect().top) / 2
-        rect = {left: nodeRect.left, right: nodeRect.right, top: top - this.width / 2, bottom: top + this.width / 2}
+        let node = this.editorView.nodeDOM(this.cursorPos! - (before ?  before.nodeSize : 0))
+        if (node) {
+          let nodeRect = (node as HTMLElement).getBoundingClientRect()
+          let top = before ? nodeRect.bottom : nodeRect.top
+          if (before && after)
+            top = (top + (this.editorView.nodeDOM(this.cursorPos!) as HTMLElement).getBoundingClientRect().top) / 2
+          rect = {left: nodeRect.left, right: nodeRect.right, top: top - this.width / 2, bottom: top + this.width / 2}
+        }
       }
     }
     if (!rect) {