diff --git a/devtools/run-test-suite.py b/devtools/run-test-suite.py
index 2b377173..433ce311 100644
--- a/devtools/run-test-suite.py
+++ b/devtools/run-test-suite.py
@@ -122,7 +122,7 @@ def compareOutputs(f, parser):
     for f in glob.glob("test-suite/**/*.p"):
         parser = Parser(f)
 
-        if any(out in parser.arguments for out in outputTest) :
+        if any(out in parser.arguments for out in outputTest) and (os.path.exists(os.path.splitext(f)[0] + ".out")) :
             compareOutputs(f, parser)
         else :
             runWithExpected(f, parser)
diff --git a/devtools/test-suite/bugs/bug_61.p b/devtools/test-suite/bugs/bug_61.p
new file mode 100644
index 00000000..8ace4b94
--- /dev/null
+++ b/devtools/test-suite/bugs/bug_61.p
@@ -0,0 +1,37 @@
+% args: -otptp 
+% result: VALID
+
+%------------------------------------------------------------------------------
+fof(c1, axiom, 
+    ! [X] :
+    (q(b)
+    | ~ s(X))).
+
+fof(c2, axiom, 
+    ! [X] :
+    (~ q(b)
+    | ~ p(X)
+    | ~ r)).
+
+fof(c3, axiom, 
+    (p(c)
+    | ~ q(c))).
+
+fof(c4, axiom, 
+    ! [Y] :
+    (p(c)
+    | q(Y))).
+
+fof(c5, axiom, 
+    (q(c)
+    | ~ q(b))).
+
+fof(c6, axiom, 
+    (r
+    | ~ p(c))).
+
+fof(c7, axiom, 
+    (s(sK1)
+    | q(b)
+    | ~ p(c))).
+%------------------------------------------------------------------------------
diff --git a/src/Mods/tptp/proof.go b/src/Mods/tptp/proof.go
index 83475561..d48b6426 100644
--- a/src/Mods/tptp/proof.go
+++ b/src/Mods/tptp/proof.go
@@ -498,7 +498,12 @@ func processMainFormula(form AST.Form) (*AST.FormList, AST.Form) {
 	case AST.And:
 		last := nf.FormList.Len() - 1
 		formList = AST.NewFormList(nf.FormList.GetElements(0, last)...)
-		form = nf.FormList.Get(last).(AST.Not).GetForm()
+		switch f := nf.FormList.Get(last).(type) {
+			case AST.Not:
+				form = f.GetForm()
+			default: 
+				form = f
+		}
 	}
 	return formList, form
 }