diff --git a/src/chilife/__init__.py b/src/chilife/__init__.py
index 64d73d3..17e2e1e 100644
--- a/src/chilife/__init__.py
+++ b/src/chilife/__init__.py
@@ -26,4 +26,4 @@
 # SpinLabel = SpinLabel.SpinLabel
 # dSpinLabel = dSpinLabel.dSpinLabel
 
-__version__ = '1.1.4'
+__version__ = '1.1.5'
diff --git a/src/chilife/io.py b/src/chilife/io.py
index bd8563e..2c68298 100644
--- a/src/chilife/io.py
+++ b/src/chilife/io.py
@@ -178,8 +178,8 @@ def read_rotlib(rotlib: Union[Path, BinaryIO] = None) -> Dict:
                                'new format.')
 
         lib = dict(files)
-
-    del lib["allow_pickle"]
+    if 'allow_pickle' in lib:
+        del lib["allow_pickle"]
 
     if "sigmas" not in lib:
         lib["sigmas"] = np.array([])