diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CParameter.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CParameter.java
index 1a3adbddf8b..a50eb79f515 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CParameter.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CParameter.java
@@ -118,11 +118,14 @@ public class CParameter implements IParameter {
 	            return ((IASTCompoundStatement)((IASTFunctionDefinition)parent).getBody()).getScope();
 	        }
 	        
-	        IASTFunctionDeclarator fdtor = (IASTFunctionDeclarator) parent.getParent().getParent();
-			parent = fdtor.getParent();
-			if( parent instanceof IASTFunctionDefinition ) {
-				return ((IASTCompoundStatement)((IASTFunctionDefinition)parent).getBody()).getScope();
-			}
+	        IASTNode fdtorNode =  parent.getParent().getParent();
+	        if (fdtorNode instanceof IASTFunctionDeclarator) {
+		        IASTFunctionDeclarator fdtor = (IASTFunctionDeclarator)fdtorNode;
+				parent = fdtor.getParent();
+				if( parent instanceof IASTFunctionDefinition ) {
+					return ((IASTCompoundStatement)((IASTFunctionDefinition)parent).getBody()).getScope();
+				}
+	        }
 	    }
 		//TODO: if not definition, find definition
 		return null;
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPArrayType.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPArrayType.java
index 2358b306348..034f1ebd314 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPArrayType.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPArrayType.java
@@ -53,7 +53,9 @@ public class CPPArrayType implements IArrayType, ITypeContainer {
         
         if( obj instanceof IArrayType ){
             try {
-                return ((IArrayType) obj).getType().isSameType( type );
+            	IType objType = ((IArrayType)obj).getType();
+            	if (objType != null)
+            		return objType.isSameType( type );
             } catch ( DOMException e ) {
                 return false;
             }
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPFunctionType.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPFunctionType.java
index 04232cf2c4e..55676d67231 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPFunctionType.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPFunctionType.java
@@ -76,7 +76,7 @@ public class CPPFunctionType implements ICPPFunctionType {
 	                return false;
 	            } else {
 					 for( int i = 0; i < parameters.length; i++ ){
-		                if( ! parameters[i].isSameType( fps[i] ) )
+		                if (parameters[i] == null || ! parameters[i].isSameType( fps[i] ) )
 		                    return false;
 		            }
 	            }
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPVisitor.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPVisitor.java
index 0608804cd4f..57b7832753d 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPVisitor.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPVisitor.java
@@ -615,6 +615,8 @@ public class CPPVisitor {
         } catch ( DOMException e ) {
             return false;
         }
+        if (clsTypeSpec == null)
+        	return false;
         IASTName clsName = clsTypeSpec.getName();
         if( clsName instanceof ICPPASTQualifiedName ){
 	        IASTName [] names = ((ICPPASTQualifiedName)clsName).getNames();