diff --git a/pr_agent/git_providers/github_provider.py b/pr_agent/git_providers/github_provider.py
index 92983baf4..2f928f82e 100644
--- a/pr_agent/git_providers/github_provider.py
+++ b/pr_agent/git_providers/github_provider.py
@@ -38,7 +38,7 @@ def __init__(self, pr_url: Optional[str] = None, incremental=IncrementalPR(False
             self.set_pr(pr_url)
             self.pr_commits = list(self.pr.get_commits())
             if self.incremental.is_incremental:
-                self.file_set = dict()
+                self.unreviewed_files_set = dict()
                 self.get_incremental_commits()
             self.last_commit_id = self.pr_commits[-1]
             self.pr_url = self.get_pr_url() # pr_url for github actions can be as api.github.com, so we need to get the url from the pr object
@@ -68,9 +68,10 @@ def get_incremental_commits(self):
                 if commit.commit.message.startswith(f"Merge branch '{self._get_repo().default_branch}'"):
                     get_logger().info(f"Skipping merge commit {commit.commit.message}")
                     continue
-                self.file_set.update({file.filename: file for file in commit.files})
+                self.unreviewed_files_set.update({file.filename: file for file in commit.files})
         else:
-            raise ValueError("No previous review found")
+            get_logger().info("No previous review found, will review the entire PR")
+            self.incremental.is_incremental = False
 
     def get_commit_range(self):
         last_review_time = self.previous_review.created_at
@@ -99,8 +100,8 @@ def get_previous_review(self, *, full: bool, incremental: bool):
                 return self.comments[index]
 
     def get_files(self):
-        if self.incremental.is_incremental and self.file_set:
-            return self.file_set.values()
+        if self.incremental.is_incremental and self.unreviewed_files_set:
+            return self.unreviewed_files_set.values()
         try:
             git_files = context.get("git_files", None)
             if git_files:
@@ -146,10 +147,10 @@ def get_diff_files(self) -> list[FilePatchInfo]:
                 new_file_content_str = self._get_pr_file_content(file, self.pr.head.sha)  # communication with GitHub
                 patch = file.patch
 
-                if self.incremental.is_incremental and self.file_set:
+                if self.incremental.is_incremental and self.unreviewed_files_set:
                     original_file_content_str = self._get_pr_file_content(file, self.incremental.last_seen_commit_sha)
                     patch = load_large_diff(file.filename, new_file_content_str, original_file_content_str)
-                    self.file_set[file.filename] = patch
+                    self.unreviewed_files_set[file.filename] = patch
                 else:
                     original_file_content_str = self._get_pr_file_content(file, self.pr.base.sha)
                     if not patch:
diff --git a/pr_agent/tools/pr_reviewer.py b/pr_agent/tools/pr_reviewer.py
index ff0c65828..854e351c6 100644
--- a/pr_agent/tools/pr_reviewer.py
+++ b/pr_agent/tools/pr_reviewer.py
@@ -108,7 +108,7 @@ async def run(self) -> None:
                                 'config': dict(get_settings().config)}
             get_logger().debug("Relevant configs", artifacts=relevant_configs)
 
-            if self.incremental.is_incremental and hasattr(self.git_provider, "file_set") and not self.git_provider.file_set:
+            if self.incremental.is_incremental and hasattr(self.git_provider, "unreviewed_files_set") and not self.git_provider.unreviewed_files_set:
                 get_logger().info(f"Incremental review is enabled for {self.pr_url} but there are no new files")
                 previous_review_url = ""
                 if hasattr(self.git_provider, "previous_review"):
@@ -324,6 +324,10 @@ def _can_run_incremental_review(self) -> bool:
         if self.is_auto and not self.incremental.first_new_commit_sha:
             get_logger().info(f"Incremental review is enabled for {self.pr_url} but there are no new commits")
             return False
+
+        if not hasattr(self.git_provider, "get_incremental_commits"):
+            get_logger().info(f"Incremental review is not supported for {get_settings().config.git_provider}")
+            return False
         # checking if there are enough commits to start the review
         num_new_commits = len(self.incremental.commits_range)
         num_commits_threshold = get_settings().pr_reviewer.minimal_commits_for_incremental_review