diff --git a/github-bot/src/main/java/io/github/martinwitt/laughing_train/mining/PeriodicMiner.java b/github-bot/src/main/java/io/github/martinwitt/laughing_train/mining/PeriodicMiner.java
index f98654cc1..82f6fdc15 100644
--- a/github-bot/src/main/java/io/github/martinwitt/laughing_train/mining/PeriodicMiner.java
+++ b/github-bot/src/main/java/io/github/martinwitt/laughing_train/mining/PeriodicMiner.java
@@ -86,7 +86,15 @@ private void mineRandomRepo() {
                 mineRandomRepo();
                 return;
             }
+
             if (checkoutResult instanceof ProjectResult.Success success) {
+                String commitHash = success.project().commitHash();
+                if (isAlreadyMined(success, commitHash)) {
+                    logger.atInfo().log(
+                            "Project %s already analyzed with commit hash %s", success.project(), commitHash);
+                    tryDeleteProject(success);
+                    mineRandomRepo();
+                }
                 logger.atInfo().log("Successfully checked out project %s", success.project());
                 var qodanaResult = analyzeProject(success);
                 if (qodanaResult instanceof QodanaResult.Failure failure) {
@@ -111,6 +119,11 @@ private void mineRandomRepo() {
         }
     }
 
+    private boolean isAlreadyMined(ProjectResult.Success success, String commitHash) {
+        return projectRepository.findByProjectUrl(success.project().url()).stream()
+                .anyMatch(it -> !it.getCommitHashes().contains(commitHash));
+    }
+
     private ProjectResult checkoutProject(Project project) throws IOException {
         return projectService.handleProjectRequest(new ProjectRequest.WithUrl(project.getProjectUrl()));
     }