diff --git a/pygmt/clib/session.py b/pygmt/clib/session.py
index f9a720eb735..043f2715620 100644
--- a/pygmt/clib/session.py
+++ b/pygmt/clib/session.py
@@ -160,7 +160,7 @@ def session_pointer(self) -> ctp.c_void_p:
             If trying to access without a currently open GMT session (i.e., outside of
             the context manager).
         """
-        if not hasattr(self, "_session_pointer") or self._session_pointer is None:
+        if getattr(self, "_session_pointer", None) is None:
             raise GMTCLibNoSessionError("No currently open GMT API session.")
         return self._session_pointer
 
@@ -338,17 +338,16 @@ def create(self, name: str):
         name
             A name for this session. Doesn't really affect the outcome.
         """
+        # Check if there is a currently open session by accessing the "session_pointer"
+        # attribute. If not, it will raise the GMTCLibNoSessionError exception and we're
+        # free to create a new one. Otherwise, we will raise a GMTCLibError exception.
         try:
-            # Won't raise an exception if there is a currently open session.
             _ = self.session_pointer
-            # In this case, fail to create a new session until the old one is destroyed.
             msg = (
-                "Failed to create a GMT API session: There is a currently open session."
-                " Must destroy it first."
+                "Failed to create a GMT API session: "
+                "There is currently an open session. Must destroy it first."
             )
             raise GMTCLibError(msg)
-        # If the exception is raised, this means that there is no open session and we're
-        # free to create a new one.
         except GMTCLibNoSessionError:
             pass