diff --git a/Sources/STTextView/STTextView+CopyPaste.swift b/Sources/STTextView/STTextView+CopyPaste.swift
index b48d653..0a17c6f 100644
--- a/Sources/STTextView/STTextView+CopyPaste.swift
+++ b/Sources/STTextView/STTextView+CopyPaste.swift
@@ -21,7 +21,8 @@ extension STTextView {
             return
         }
 
-        let nsrange = NSRange(textLayoutManager.insertionPointLocation!, in: textContentStorage)
+        let insertLocation = textLayoutManager.insertionPointLocation ?? textLayoutManager.documentRange.location
+        let nsrange = NSRange(insertLocation, in: textContentStorage)
         insertText(string, replacementRange: nsrange)
     }
 
diff --git a/Sources/STTextView/STTextView.swift b/Sources/STTextView/STTextView.swift
index 3fe31ff..2ef6af2 100644
--- a/Sources/STTextView/STTextView.swift
+++ b/Sources/STTextView/STTextView.swift
@@ -418,14 +418,21 @@ extension STTextView: NSTextViewportLayoutControllerDelegate {
     }
 
     func updateSelectionHighlights() {
-        guard !textLayoutManager.textSelections.isEmpty else { return }
+        guard !textLayoutManager.textSelections.isEmpty else {
+            selectionView.subviews = []
+            return
+        }
 
         selectionView.subviews = []
-        
+
         for textSelection in textLayoutManager.textSelections {
             for textRange in textSelection.textRanges {
                 textLayoutManager.enumerateTextSegments(in: textRange, type: .highlight, options: []) {(textSegmentRange, textSegmentFrame, baselinePosition, textContainer) in
                     var highlightFrame = textSegmentFrame.intersection(frame)
+                    guard !highlightFrame.isNull else {
+                        return true
+                    }
+
                     let highlight = STTextSelectionView()
                     highlight.wantsLayer = true