diff --git a/src/pythermogis/__init__.py b/src/pythermogis/__init__.py
index e8b76fdd8ed0934b59bc4a5753f436d23be4d636..6d77ee87309129c3994843f48a796cb2e98a1ee5 100644
--- a/src/pythermogis/__init__.py
+++ b/src/pythermogis/__init__.py
@@ -8,4 +8,4 @@ from pythermogis.doublet_simulation.deterministic_doublet import *
 from pythermogis.doublet_simulation.stochastic_doublet import *
 from pythermogis.plotting.plot_exceedance import plot_exceedance
 from pythermogis.dask_utils.auto_chunk  import auto_chunk_dataset
-from pythermogis.dask_utils.assess_optimal_chunk_size import assess_optimal_chunk_size
\ No newline at end of file
+from pythermogis.dask_utils.assess_optimal_chunk_size import assess_optimal_chunk_size
diff --git a/src/pythermogis/thermogis_classes/doublet.py b/src/pythermogis/thermogis_classes/doublet.py
index 3360a824e7ba0769e48cfff1785798bdf95501d1..c82e3fedb082401412e29e6ef347ac7d91331048 100644
--- a/src/pythermogis/thermogis_classes/doublet.py
+++ b/src/pythermogis/thermogis_classes/doublet.py
@@ -122,6 +122,9 @@ def calculate_performance_of_single_location(mask: float, depth: float, thicknes
     results = doublet.calculateDoubletPerformance(input)
 
     # If calculation was not successful, return mask value
+    if results is None:
+        return (mask_value,) * 14
+
     if results.utc() == -9999.0:
         return (mask_value,) * 14
 
diff --git a/src/pythermogis/thermogis_classes/jvm_start.py b/src/pythermogis/thermogis_classes/jvm_start.py
index a4f72f3e4991bd6d68f1a43f12ff9842f0da126f..2bff18505c33780cf828b982eacb37da39145b40 100644
--- a/src/pythermogis/thermogis_classes/jvm_start.py
+++ b/src/pythermogis/thermogis_classes/jvm_start.py
@@ -48,3 +48,17 @@ def close_jvm():
     """
     if jpype.isJVMStarted():
         jpype.shutdownJVM()
+
+def print_java_path():
+    """
+    This method prints the path to the JVM being used
+    :return:
+    """
+    print(os.getenv("JAVA_HOME"))
+
+def print_thermogis_jar_path():
+    """
+    This method prints the path to the Thermogis Jar being used
+    :return:
+    """
+    print(get_thermogis_jar_path())
diff --git a/tests/test_java_installation.py b/tests/test_java_installation.py
index e9dccde089e5166a21e195839c27d7c0b1b61fd8..1dea75f33c3a547cb8e7cb20d0bd0e50b76ff032 100644
--- a/tests/test_java_installation.py
+++ b/tests/test_java_installation.py
@@ -1,4 +1,9 @@
-from pythermogis import start_jvm
+from pythermogis import print_java_path, print_thermogis_jar_path, start_jvm
+
 
 def test_JVM_start():
-    start_jvm()
\ No newline at end of file
+    start_jvm()
+
+def test_JVM_JAR_print():
+    print_java_path()
+    print_thermogis_jar_path()
\ No newline at end of file