diff --git a/geos-ats/src/geos/ats/helpers/curve_check.py b/geos-ats/src/geos/ats/helpers/curve_check.py
index a35b27f..31250c7 100644
--- a/geos-ats/src/geos/ats/helpers/curve_check.py
+++ b/geos-ats/src/geos/ats/helpers/curve_check.py
@@ -33,16 +33,18 @@ def interpolate_values_time( ta, xa, tb ):
     """
     N = list( np.shape( xa ) )
     M = len( tb )
+    ta = np.ascontiguousarray( np.squeeze( ta ) )
+    tb = np.ascontiguousarray( np.squeeze( tb ) )
 
     if ( len( N ) == 1 ):
         return interp1d( ta, xa )( tb )
     else:
         # Reshape the input array so that we can work on the non-time axes
-        S = np.product( N[ 1: ] )
+        S = np.prod( N[ 1: ] )
         xc = np.reshape( xa, ( N[ 0 ], S ) )
         xd = np.zeros( ( len( tb ), S ) )
         for ii in range( S ):
-            xd[ :, ii ] = interp1d( ta, xc[ :, ii ] )( tb )
+            xd[ :, ii ] = interp1d( ta, xc[ :, ii ], bounds_error=False, fill_value='extrapolate' )( tb )
 
         # Return the array to it's expected shape
         N[ 0 ] = M
diff --git a/geos-ats/src/geos/ats/test_case.py b/geos-ats/src/geos/ats/test_case.py
index 9c3c27f..7affe6c 100644
--- a/geos-ats/src/geos/ats/test_case.py
+++ b/geos-ats/src/geos/ats/test_case.py
@@ -1,4 +1,4 @@
-import ats  # type: ignore[import]
+import ats  # type: ignore[import]
 import os
 import shutil
 import logging
@@ -319,7 +319,7 @@ def testCreate( self ):
             priority = 1
 
         # Setup a new test group
-        atsTest = None
+        parent_test = None
         ats.tests.AtsTest.newGroup( priority=priority, path=self.path )
         for stepnum, step in enumerate( self.steps ):
             np = getattr( step.p, "np", 1 )
@@ -329,10 +329,10 @@ def testCreate( self ):
             label = "%s_%d_%s" % ( self.name, stepnum + 1, step.label() )
 
             # call either 'test' or 'testif'
-            if atsTest is None:
+            if parent_test is None:
                 func = lambda *a, **k: test( *a, **k )
             else:
-                func = lambda *a, **k: testif( atsTest, *a, **k )
+                func = lambda *a, **k: testif( parent_test, *a, **k )
 
             # Set the time limit
             kw = {}
@@ -359,6 +359,11 @@ def testCreate( self ):
             if self.last_status == PASSED:
                 atsTest.status = SKIPPED
 
+            # Set the parent test
+            # Note: do not make tests dependent on the result of curvecheck
+            if step.label() != 'curvecheck':
+                parent_test = atsTest
+
         # End the group
         ats.tests.AtsTest.endGroup()