diff --git a/src/lib/components/modes/textmode/TextMode.svelte b/src/lib/components/modes/textmode/TextMode.svelte
index 54b9ca9b..17b1efa6 100644
--- a/src/lib/components/modes/textmode/TextMode.svelte
+++ b/src/lib/components/modes/textmode/TextMode.svelte
@@ -555,7 +555,9 @@
 
     const state = EditorState.create({
       doc: initialText,
-      selection: toCodeMirrorSelection(externalSelection),
+      selection: isValidSelection(externalSelection, initialText)
+        ? toCodeMirrorSelection(externalSelection)
+        : undefined,
       extensions: [
         keymap.of([indentWithTab, formatCompactKeyBinding]),
         linterCompartment.of(createLinter()),
@@ -632,6 +634,14 @@
       : false
   }
 
+  function isValidSelection(selection: JSONEditorSelection | null, text: string): boolean {
+    if (!isTextSelection(selection)) {
+      return false
+    }
+
+    return selection.ranges.every((range) => range.anchor < text.length && range.head < text.length)
+  }
+
   function toRichValidationError(validationError: ValidationError): RichValidationError {
     const { path, message, severity } = validationError
     const { line, column, from, to } = findTextLocation(normalization.escapeValue(text), path)