diff --git a/lib/path.js b/lib/path.js
index 45934329..f37f12ea 100644
--- a/lib/path.js
+++ b/lib/path.js
@@ -58,7 +58,7 @@ const readNumber = (string, cursor) => {
         continue;
       }
       if (state === 'e') {
-        state === 'exponent_sign';
+        state = 'exponent_sign';
         value += c;
         continue;
       }
@@ -216,7 +216,7 @@ const stringifyNumber = ({ number, precision }) => {
   } else {
     result = number.toFixed(precision);
     if (result.includes('.')) {
-      result = result.replace(/\.?0+$/, '')
+      result = result.replace(/\.?0+$/, '');
     }
   }
   // remove zero whole from decimal number
diff --git a/lib/path.test.js b/lib/path.test.js
index a677f8dc..eca120c2 100644
--- a/lib/path.test.js
+++ b/lib/path.test.js
@@ -47,6 +47,11 @@ describe('parse path data', () => {
     expect(parsePathData('L 10 20')).to.deep.equal([]);
     expect(parsePathData('10 20')).to.deep.equal([]);
   });
+  it('should stop on invalid scientific notation', () => {
+    expect(parsePathData('M 0 5e++1 L 0 0')).to.deep.equal([
+      { command: 'M', args: [0, 5] },
+    ]);
+  });
   it('should stop on invalid numbers', () => {
     expect(parsePathData('M ...')).to.deep.equal([]);
   });