diff --git a/src/apps/companies/apps/add-company/__test__/postcodeRegionLookup.test.js b/src/apps/companies/apps/add-company/__test__/postcodeRegionLookup.test.js
index 9304d10a6fa..d56d223ea39 100644
--- a/src/apps/companies/apps/add-company/__test__/postcodeRegionLookup.test.js
+++ b/src/apps/companies/apps/add-company/__test__/postcodeRegionLookup.test.js
@@ -17,11 +17,13 @@ describe('Postcode to region mapping', () => {
       const invalidPostcode3 = 'A12'
       const invalidPostcode4 = undefined
       const invalidPostcode5 = null
+      const invalidPostcode6 = 'SW11'
       expect(mapPostcodeToRegion(invalidPostcode1)).to.equal('')
       expect(mapPostcodeToRegion(invalidPostcode2)).to.equal('')
       expect(mapPostcodeToRegion(invalidPostcode3)).to.equal('')
       expect(mapPostcodeToRegion(invalidPostcode4)).to.equal('')
       expect(mapPostcodeToRegion(invalidPostcode5)).to.equal('')
+      expect(mapPostcodeToRegion(invalidPostcode6)).to.equal('')
     })
   })
 
diff --git a/src/apps/companies/apps/add-company/client/transformer.js b/src/apps/companies/apps/add-company/client/transformer.js
index 7f8e739492e..3e877a8b556 100644
--- a/src/apps/companies/apps/add-company/client/transformer.js
+++ b/src/apps/companies/apps/add-company/client/transformer.js
@@ -146,7 +146,11 @@ export const mapPostcodeToRegion = (postcode) => {
     ) {
       return postcode
     }
-    const area = outcode.split(outcode.match(/\d+/)[0])[0]
+    const numericMatch = outcode.match(/\d+/)
+    if (!numericMatch) {
+      return ''
+    }
+    const area = outcode.split(numericMatch[0])[0]
     return POSTCODE_AREA_TO_REGION[area]
   }
 }