diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index c7dfa31..e018a5e 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -8,6 +8,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 
 
+
+[v0.17.1] - 2025-09-17
+----------------------
+
+Fixed
+~~~~~
+
+* wrong type checking inside `__init__` of `get_client`. Now initialize with GetCapabilities url
+
+
 [v0.17.0] - 2025-09-16
 ----------------------
 
diff --git a/ows_lib/__init__.py b/ows_lib/__init__.py
index d8b116e..cb42eec 100644
--- a/ows_lib/__init__.py
+++ b/ows_lib/__init__.py
@@ -1,2 +1,2 @@
-__version__ = "0.17.0"
+__version__ = "0.17.1"
 VERSION = __version__  # synonym
diff --git a/ows_lib/client/mixins.py b/ows_lib/client/mixins.py
index 748ef6e..863ecf4 100644
--- a/ows_lib/client/mixins.py
+++ b/ows_lib/client/mixins.py
@@ -32,7 +32,7 @@ def __init__(
 
         if isinstance(capabilities, OGCServiceMixin):
             self.capabilities = capabilities
-        elif capabilities is str and "?" in capabilities:
+        elif isinstance(capabilities, str) and "?" in capabilities:
             # client was initialized with an url
             response = self.send_request(
                 request=Request(method="GET", url=capabilities))
@@ -41,7 +41,9 @@ def __init__(
             else:
                 raise InitialError(
                     f"client could not be initialized by the given url: {capabilities}. Response status code: {response.status_code}")
-
+        else:
+            raise TypeError("capabilities has to be GetCapabilities URL or parsed capabilites of type OGCServiceMixin")
+        
     def send_request(self, request: OGCRequest, timeout: int = 10) -> Response:
         """Sends a given request with internal session object.