change offset key logic to never throw when not found

src/components/content.js

@@ -134,6 +134,8 @@ class Content extends React.Component {
     const { document } = state
     const schema = editor.getSchema()
     const offsetKey = OffsetKey.findKey(element, offset)
+    if (!offsetKey) return null
+
     const { key } = offsetKey
     const node = document.getDescendant(key)
     const decorators = document.getDescendantDecorators(key, schema)
@@ -399,6 +401,8 @@ class Content extends React.Component {
     const startNode = range.startContainer
     const startOffset = range.startOffset
     const point = this.getPoint(startNode, startOffset)
+    if (!point) return
+
     const target = Selection.create({
       anchorKey: point.key,
       anchorOffset: point.offset,
@@ -441,9 +445,10 @@ class Content extends React.Component {
     const native = window.getSelection()
     const { anchorNode, anchorOffset } = native
     const point = this.getPoint(anchorNode, anchorOffset)
-    const { key, index, start, end } = point
+    if (!point) return
 
     // Get the range in question.
+    const { key, index, start, end } = point
     const { state, editor } = this.props
     const { document, selection } = state
     const schema = editor.getSchema()
@@ -622,6 +627,7 @@ class Content extends React.Component {
       const { anchorNode, anchorOffset, focusNode, focusOffset } = native
       const anchor = this.getPoint(anchorNode, anchorOffset)
       const focus = this.getPoint(focusNode, focusOffset)
+      if (!anchor || !focus) return
 
       // There are valid situations where a select event will fire when we're
       // already at that position (for example when entering a character), since

src/utils/offset-key.js

@@ -75,6 +75,7 @@ function findKey(rawNode, rawOffset) {
   // ancestor, so find it by going down from the nearest void parent.
   if (!closest) {
     const closestVoid = parentNode.closest(VOID_SELECTOR)
+    if (!closestVoid) return null
     closest = closestVoid.querySelector(SELECTOR)
     offset = closest.textContent.length
   }
@@ -82,10 +83,8 @@ function findKey(rawNode, rawOffset) {
   // Get the string value of the offset key attribute.
   offsetKey = closest.getAttribute(ATTRIBUTE)
 
-  // If we still didn't find an offset key, this is a bug.
+  // If we still didn't find an offset key, abort.
-  if (!offsetKey) {
+  if (!offsetKey) return null
-    throw new Error(`Unable to find offset key for ${node} with offset "${offset}".`)
-  }
 
   // Return the parsed the offset key.
   const parsed = parse(offsetKey)