diff --git a/src/main/groovy/de/gliderpilot/gradle/semanticrelease/GithubRepo.groovy b/src/main/groovy/de/gliderpilot/gradle/semanticrelease/GithubRepo.groovy
index f244ed6..9a8bd68 100644
--- a/src/main/groovy/de/gliderpilot/gradle/semanticrelease/GithubRepo.groovy
+++ b/src/main/groovy/de/gliderpilot/gradle/semanticrelease/GithubRepo.groovy
@@ -86,6 +86,9 @@ class GithubRepo extends GitRepo {
         boolean isGithubComRepository = (repositoryUrl ==~ /.*github.com[\/:]((?:.+?)\/(?:.+?))(?:\.git)/)
         Matcher matcher = (repositoryUrl =~ /.+[\/:](.+?\/.+?)(?:\.git)$/)
 
+        if (!matcher)
+            return null
+
         if (isGithubComRepository || this.isGhEnterprise) {
             return matcher.group(1)
         }