diff --git a/semver/scm/git.py b/semver/scm/git.py
index 80f76d4..cc1255a 100644
--- a/semver/scm/git.py
+++ b/semver/scm/git.py
@@ -29,7 +29,7 @@ class Git(SCM):
 
     def _run_command(
         self, *args: str, throwExceptions: bool = True
-    ) -> subprocess.CompletedProcess[str]:
+    ) -> subprocess.CompletedProcess:
         return subprocess.run(
             args,
             capture_output=True,
@@ -82,7 +82,11 @@ class Git(SCM):
                 f"Error getting latest tagged git version: {str(e.stderr).rstrip()}"
             )
 
-        if len(tagged_versions) > 0 and tagged_versions[-1] != "":
+        if (
+            tagged_versions is not None
+            and len(tagged_versions) > 0
+            and tagged_versions[-1] != ""
+        ):
             version = tagged_versions[-1]
 
         logger.debug(f"Tag Version: {version}")