diff --git a/tests/TestPDDLParser.cpp b/tests/TestPDDLParser.cpp
index a0c1100..254390b 100644
--- a/tests/TestPDDLParser.cpp
+++ b/tests/TestPDDLParser.cpp
@@ -370,4 +370,7 @@ TEST(PDDLParserTests, CheckIssues)
 {
 	// Check white space issues with constants and parsing unsupported sections
 	ASSERT_NO_THROW(Description::fromFile("data/issues/issue-1.pddl"));
+
+	// Check white space issues with empty n-ary predicates
+	ASSERT_NO_THROW(Description::fromFile("data/issues/issue-2.pddl"));
 }
diff --git a/tests/data/issues/issue-2.pddl b/tests/data/issues/issue-2.pddl
new file mode 100644
index 0000000..bdb5b3f
--- /dev/null
+++ b/tests/data/issues/issue-2.pddl
@@ -0,0 +1,51 @@
+
+(define (domain openstacks-netbenefit-numeric-ADL)
+  (:requirements :typing :adl :numeric-fluents :goal-utilities)
+  (:types order product)
+  (:predicates (includes ?o - order ?p - product)
+	       (waiting ?o - order)
+	       (started ?o - order)
+	       (shipped ?o - order)
+	       (delivered ?o - order ?p - product)
+	       (made ?p - product))
+
+(:functions (total-cost) 
+	      (stacks-in-use)
+	      (max-in-use)
+	      (stack-cost) )
+	       
+  (:action open-new-stack
+    :parameters ()
+    :precondition (and)
+    :effect (and (increase (max-in-use) 1)
+		 (increase (total-cost) (stack-cost)))
+    )
+	      
+   (:action start-order
+    :parameters (?o - order)
+    :precondition (and (waiting ?o)
+		    (< (stacks-in-use) (max-in-use)))
+    :effect (and (not (waiting ?o))
+		 (started ?o)
+		 (increase (stacks-in-use) 1))
+    )
+    
+  (:action make-product
+    :parameters (?p - product)
+    :precondition (and (not (made ?p)))
+    :effect (and (made ?p)
+		 (forall (?o - order)
+			 (when (and (includes ?o ?p)
+				    (started ?o))
+			   (delivered ?o ?p))))
+    )
+    
+  (:action ship-order
+    :parameters (?o - order)
+    :precondition (and (started ?o))
+    :effect (and (not (started ?o))
+		 (shipped ?o)
+		 (decrease (stacks-in-use) 1))
+    )
+
+  )