diff --git a/lib/CrEOF/Geo/WKB/Parser.php b/lib/CrEOF/Geo/WKB/Parser.php
index ce30e38..bdd93f6 100644
--- a/lib/CrEOF/Geo/WKB/Parser.php
+++ b/lib/CrEOF/Geo/WKB/Parser.php
@@ -154,7 +154,7 @@ private function readGeometry()
             }
 
             $this->dimensions = $this->getDimensions($this->type);
-            $this->pointSize  = 2 + strlen($this->getDimensionType($this->dimensions));
+            $this->pointSize  = 2 + strlen($this->getDimensionType($this->dimensions) || '');
 
             $typeName = $this->getTypeName($this->type);