diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ebc9f2..68cfdbf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -77,3 +77,7 @@
 
 1.0.18
   - added missing change log for version 1.0.17
+
+1.0.19
+  - fixed nulll check for theme options in the demos
+  - removed extranious variable from the drawLink method
diff --git a/demo_app/src/demos/ThemeEventsReset/ThemeEventsReset.tsx b/demo_app/src/demos/ThemeEventsReset/ThemeEventsReset.tsx
index c813426..8f0ba3f 100644
--- a/demo_app/src/demos/ThemeEventsReset/ThemeEventsReset.tsx
+++ b/demo_app/src/demos/ThemeEventsReset/ThemeEventsReset.tsx
@@ -36,7 +36,7 @@ export default function ThemeEventsReset() {
 				<div className='noBlock' style={{ marginLeft: "10px" }}>
 					See the JavaScript console for example events.<br />
 					Select A theme: <select value={theme} onChange={e => {
-						if(changes!==null) MergeMapChanges(changes,data)
+						if(changes!=null) MergeMapChanges(changes,data)
 							console.log(data);
 						setTheme(e.target.value);
 					}} name="theme">
diff --git a/demo_app/src/demos/VariedNodeSize/VariedNodeSize.tsx b/demo_app/src/demos/VariedNodeSize/VariedNodeSize.tsx
index 875f8e9..36a1378 100644
--- a/demo_app/src/demos/VariedNodeSize/VariedNodeSize.tsx
+++ b/demo_app/src/demos/VariedNodeSize/VariedNodeSize.tsx
@@ -45,7 +45,7 @@ export default function VariedNodeSize() {
 				<div className='noBlock' style={{ marginLeft: "10px" }}>
 					See the JavaScript console for example events.<br />
 					Select A theme: <select value={theme} onChange={e => {
-						if(changes!==null) MergeMapChanges(changes,data)
+						if(changes!=null) MergeMapChanges(changes,data)
 							console.log(data);
 						setTheme(e.target.value);
 					}} name="theme">
diff --git a/package.json b/package.json
index cdff4a8..3f9b8f8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "linked-bundle-node-map",
-  "version": "1.0.18",
+  "version": "1.0.19",
   "types": "dist/LinkedBundleNodeMap.d.ts",
   "funding": "https://github.com/sponsors/akalinux",
   "homepage": "https://github.com/akalinux/linked-bundle-node-map",
diff --git a/src/Calculator.ts b/src/Calculator.ts
index 9a7e573..1dbe76e 100644
--- a/src/Calculator.ts
+++ b/src/Calculator.ts
@@ -541,7 +541,6 @@ export default class Calculator extends CalculatorBase {
       links: [],
       bundles: [],
     }
-    const tick=this.tick
     for (let i = 0; i < l.length; ++i) {
       const link = l[i];
       const r = o + i * incBy;
@@ -586,7 +585,6 @@ export default class Calculator extends CalculatorBase {
         }
       }
     }
-    this.tick=tick
     const se = this.getXY(c.x, c.y, boxR, sa);
     const sw = this.getXY(p.x, p.y, boxR, sa);
     const bl = ls.bl = [] as { c: Cordinate, b: string }[];