diff --git a/src/editor/parts.js b/src/editor/parts.js
index 8ba18997a9..bf792b1ab9 100644
--- a/src/editor/parts.js
+++ b/src/editor/parts.js
@@ -57,7 +57,7 @@ class BasePart {
     appendUntilRejected(str) {
         for (let i = 0; i < str.length; ++i) {
             const chr = str.charAt(i);
-            if (!this.acceptsInsertion(chr)) {
+            if (!this.acceptsInsertion(chr, i)) {
                 this._text = this._text + str.substr(0, i);
                 return str.substr(i);
             }
@@ -180,8 +180,8 @@ class PillPart extends BasePart {
 }
 
 export class NewlinePart extends BasePart {
-    acceptsInsertion(chr) {
-        return this.text.length === 0 && chr === "\n";
+    acceptsInsertion(chr, i) {
+        return (this.text.length + i) === 0 && chr === "\n";
     }
 
     acceptsRemoval(position, chr) {