diff --git a/pkg/crawler/crawler.go b/pkg/crawler/crawler.go
index 3a0afca..b88c0b4 100644
--- a/pkg/crawler/crawler.go
+++ b/pkg/crawler/crawler.go
@@ -23,7 +23,7 @@ import (
 	"github.com/aquasecurity/trivy-java-db/pkg/types"
 )
 
-const mavenRepoURL = "https://repo.maven.apache.org/maven2/"
+const mavenRepoURL = "https://repo.maven.apache.org/maven2/academy/compose/companion/multi-fab/"
 
 type Crawler struct {
 	dir  string
@@ -230,10 +230,12 @@ func (c *Crawler) crawlSHA1(ctx context.Context, baseURL string, meta *Metadata,
 			return !bytes.Equal(v.SHA1, dirVersionSha1)
 		})
 
-		versions = append(versions, Version{
-			Version: dirVersion,
-			SHA1:    dirVersionSha1,
-		})
+		if dirVersionSha1 != nil {
+			versions = append(versions, Version{
+				Version: dirVersion,
+				SHA1:    dirVersionSha1,
+			})
+		}
 
 		foundVersions = append(foundVersions, versions...)
 	}
diff --git a/pkg/crawler/testdata/abbot_abbot.html b/pkg/crawler/testdata/abbot_abbot.html
index c12f4bf..ecba60b 100644
--- a/pkg/crawler/testdata/abbot_abbot.html
+++ b/pkg/crawler/testdata/abbot_abbot.html
@@ -21,6 +21,7 @@ <h1>abbot/abbot</h1>
 <a href="0.12.3/" title="0.12.3/">0.12..../</a>                                           2005-09-20 05:44         -
 <a href="0.13.0/" title="0.13.0/">0.13.0/</a>                                           2005-09-20 05:44         -
 <a href="1.4.0/" title="1.4.0/">1.4.0/</a>                                            2015-09-22 16:03         -
+<a href="1.5.0/" title="1.5.0/">1.5.0/</a>                                            2015-09-22 16:03         -
 <a href="maven-metadata.xml" title="maven-metadata.xml">maven-metadata.xml</a>                                2015-09-24 14:18       402
 <a href="maven-metadata.xml.md5" title="maven-metadata.xml.md5">maven-metadata.xml.md5</a>                            2015-09-24 14:18        32
 <a href="maven-metadata.xml.sha1" title="maven-metadata.xml.sha1">maven-metadata.xml.sha1</a>                           2015-09-24 14:18        40