diff --git a/fdroidserver/common.py b/fdroidserver/common.py
index 586867a6..2a59152a 100644
--- a/fdroidserver/common.py
+++ b/fdroidserver/common.py
@@ -3047,6 +3047,19 @@ def apk_extract_signatures(apkpath, outdir, manifest=True):
                     out_file.write(in_apk.read(f.filename))
 
 
+def get_min_sdk_version(apk):
+    """
+    This wraps the androguard function to always return and int and fall back to 1
+    if we can't get a valid minsdk version
+    :param apk: androguard apk object
+    :return: minsdk as int
+    """
+    try:
+        return int(apk.get_min_sdk_version())
+    except TypeError:
+        return 1
+
+
 def sign_apk(unsigned_path, signed_path, keyalias):
     """Sign and zipalign an unsigned APK, then save to a new file, deleting the unsigned
 
@@ -3068,7 +3081,7 @@ def sign_apk(unsigned_path, signed_path, keyalias):
 
     """
     apk = _get_androguard_APK(unsigned_path)
-    if int(apk.get_target_sdk_version()) >= 30:
+    if apk.get_effective_target_sdk_version() >= 30:
         if config['keystore'] == 'NONE':
             # NOTE: apksigner doesn't like -providerName/--provider-name at all, don't use
             #       apksigner documents the options as --ks-provider-class and --ks-provider-arg
@@ -3098,7 +3111,7 @@ def sign_apk(unsigned_path, signed_path, keyalias):
         os.remove(unsigned_path)
     else:
 
-        if int(apk.get_min_sdk_version()) < 18:
+        if get_min_sdk_version(apk) < 18:
             signature_algorithm = ['-sigalg', 'SHA1withRSA', '-digestalg', 'SHA1']
         else:
             signature_algorithm = ['-sigalg', 'SHA256withRSA', '-digestalg', 'SHA-256']
diff --git a/tests/common.TestCase b/tests/common.TestCase
index 98815d5b..ca06de8b 100755
--- a/tests/common.TestCase
+++ b/tests/common.TestCase
@@ -697,6 +697,37 @@ class CommonTest(unittest.TestCase):
         # verify it has a v2 signature
         self.assertTrue(fdroidserver.common._get_androguard_APK(signed).is_signed_v2())
 
+    def test_sign_no_targetsdk(self):
+        fdroidserver.common.config = None
+        config = fdroidserver.common.read_config(fdroidserver.common.options)
+        if not fdroidserver.common.find_apksigner():
+            self.skipTest('SKIPPING as apksigner is not installed!')
+        config['jarsigner'] = fdroidserver.common.find_sdk_tools_cmd('jarsigner')
+        config['keyalias'] = 'sova'
+        config['keystorepass'] = 'r9aquRHYoI8+dYz6jKrLntQ5/NJNASFBacJh7Jv2BlI='
+        config['keypass'] = 'r9aquRHYoI8+dYz6jKrLntQ5/NJNASFBacJh7Jv2BlI='
+        config['keystore'] = os.path.join(self.basedir, 'keystore.jks')
+        testdir = tempfile.mkdtemp(prefix=inspect.currentframe().f_code.co_name, dir=self.tmpdir)
+
+        shutil.copy(os.path.join(self.basedir, 'no_targetsdk_minsdk30_unsigned.apk'), testdir)
+        unsigned = os.path.join(testdir, 'no_targetsdk_minsdk30_unsigned.apk')
+        signed = os.path.join(testdir, 'no_targetsdk_minsdk30_signed.apk')
+
+        fdroidserver.common.sign_apk(unsigned, signed, config['keyalias'])
+        self.assertTrue(fdroidserver.common.verify_apk_signature(signed))
+        self.assertTrue(fdroidserver.common._get_androguard_APK(signed).is_signed_v2())
+
+        shutil.copy(os.path.join(self.basedir, 'no_targetsdk_minsdk1_unsigned.apk'), testdir)
+        unsigned = os.path.join(testdir, 'no_targetsdk_minsdk1_unsigned.apk')
+        signed = os.path.join(testdir, 'no_targetsdk_minsdk1_signed.apk')
+
+        self.assertFalse(fdroidserver.common.verify_apk_signature(unsigned))
+        fdroidserver.common.sign_apk(unsigned, signed, config['keyalias'])
+
+        self.assertTrue(os.path.isfile(signed))
+        self.assertFalse(os.path.isfile(unsigned))
+        self.assertTrue(fdroidserver.common.verify_apk_signature(signed))
+
     def test_get_apk_id(self):
         config = dict()
         fdroidserver.common.fill_config_defaults(config)
@@ -796,11 +827,11 @@ class CommonTest(unittest.TestCase):
         """This is a sanity test that androguard isn't broken"""
         def get_minSdkVersion(apkfile):
             apk = fdroidserver.common._get_androguard_APK(apkfile)
-            return int(apk.get_min_sdk_version())
+            return fdroidserver.common.get_min_sdk_version(apk)
 
         def get_targetSdkVersion(apkfile):
             apk = fdroidserver.common._get_androguard_APK(apkfile)
-            return int(apk.get_target_sdk_version())
+            return apk.get_effective_target_sdk_version()
 
         self.assertEqual(4, get_minSdkVersion('bad-unicode-πÇÇ现代通用字-български-عربي1.apk'))
         self.assertEqual(14, get_minSdkVersion('org.bitbucket.tickytacky.mirrormirror_1.apk'))
@@ -826,6 +857,8 @@ class CommonTest(unittest.TestCase):
         self.assertEqual(4, get_minSdkVersion('repo/urzip-; Рахма́, [rɐxˈmanʲɪnəf] سيرجي_رخمانينوف 谢·.apk'))
 
         self.assertEqual(30, get_targetSdkVersion('minimal_targetsdk_30_unsigned.apk'))
+        self.assertEqual(1, get_targetSdkVersion('no_targetsdk_minsdk1_unsigned.apk'))
+        self.assertEqual(30, get_targetSdkVersion('no_targetsdk_minsdk30_unsigned.apk'))
 
     def test_apk_release_name(self):
         appid, vercode, sigfp = fdroidserver.common.apk_parse_release_filename('com.serwylo.lexica_905.apk')
diff --git a/tests/no_targetsdk_minsdk1_unsigned.apk b/tests/no_targetsdk_minsdk1_unsigned.apk
new file mode 100644
index 00000000..225e52bc
Binary files /dev/null and b/tests/no_targetsdk_minsdk1_unsigned.apk differ
diff --git a/tests/no_targetsdk_minsdk30_unsigned.apk b/tests/no_targetsdk_minsdk30_unsigned.apk
new file mode 100644
index 00000000..ae8e86b5
Binary files /dev/null and b/tests/no_targetsdk_minsdk30_unsigned.apk differ