diff --git a/src/main/kotlin/com/vk/kphpstorm/exphptype/ExPhpTypeInstance.kt b/src/main/kotlin/com/vk/kphpstorm/exphptype/ExPhpTypeInstance.kt
index f5bf861..33512c4 100644
--- a/src/main/kotlin/com/vk/kphpstorm/exphptype/ExPhpTypeInstance.kt
+++ b/src/main/kotlin/com/vk/kphpstorm/exphptype/ExPhpTypeInstance.kt
@@ -14,8 +14,11 @@ class ExPhpTypeInstance(val fqn: String) : ExPhpType {
     override fun toString() = fqn
 
     override fun toHumanReadable(expr: PhpPsiElement) =
-            if (fqn.startsWith('\\')) PhpCodeInsightUtil.createQualifiedName(PhpCodeInsightUtil.findScopeForUseOperator(expr)!!, fqn)
-            else fqn
+        if (fqn.startsWith('\\')) PhpCodeInsightUtil.createQualifiedName(
+            PhpCodeInsightUtil.findScopeForUseOperator(expr)!!,
+            fqn
+        )
+        else fqn
 
     override fun toPhpType(): PhpType {
         return PhpType().add(fqn)
@@ -28,11 +31,43 @@ class ExPhpTypeInstance(val fqn: String) : ExPhpType {
     override fun instantiateTemplate(nameMap: Map<String, ExPhpType>): ExPhpType {
         return nameMap[fqn] ?: this
     }
+    private fun canBeAssigned(l: ExPhpTypeInstance, r: ExPhpTypeInstance) = with(ExPhpType.Companion) {
+        when {
+            l === ExPhpTypeInstance(KphpPrimitiveTypes.OBJECT)   -> r === ExPhpTypeInstance(KphpPrimitiveTypes.OBJECT)
+            else           -> false       // not supposed to happen
+        }
+    }
 
     override fun isAssignableFrom(rhs: ExPhpType, project: Project): Boolean = when (rhs) {
         is ExPhpTypeAny       -> true
         is ExPhpTypePipe      -> rhs.isAssignableTo(this, project)
-        is ExPhpTypeNullable  -> isAssignableFrom(rhs.inner, project)
+        is ExPhpTypeNullable -> {
+         /*   if(this === ExPhpType.OBJECT){
+
+            }
+            rhs === ExPhpType.OBJECT || rhs === ExPhpType.NULL*/
+            /*ExPhpType.OBJECT
+            val OBJECT = ExPhpTypeInstance(KphpPrimitiveTypes.OBJECT)
+            rhs === OBJECT || rhs === ExPhpType.NULL*/
+            /*if(this as ExPhpTypeNullable && rhs is ExPhpTypeNullable){
+                false
+            }*/
+            false
+            /*val t = canBeAssigned(this, ExPhpTypeInstance(KphpPrimitiveTypes.NULL))
+           if( this === ExPhpTypeInstance(KphpPrimitiveTypes.OBJECT)){
+               rhs === ExPhpTypeInstance(KphpPrimitiveTypes.NULL)
+           }else{
+               isAssignableFrom(rhs.inner, project)
+           }*/
+           /* canBeAssigned(this, ExPhpTypeInstance(KphpPrimitiveTypes.NULL))
+          val t =  this.fqn
+            if (rhs.toString() != fqn) {
+                false
+            } else {
+                isAssignableFrom(rhs.inner, project)
+            }*/
+        }
+
         is ExPhpTypePrimitive -> rhs === ExPhpType.NULL || rhs === ExPhpType.OBJECT
 
         // rhs can be assigned if: rhs == lhs or rhs is child of lhs (no matter, lhs is interface or class)
diff --git a/src/main/kotlin/com/vk/kphpstorm/exphptype/ExPhpTypeNullable.kt b/src/main/kotlin/com/vk/kphpstorm/exphptype/ExPhpTypeNullable.kt
index 2c281fd..d147941 100644
--- a/src/main/kotlin/com/vk/kphpstorm/exphptype/ExPhpTypeNullable.kt
+++ b/src/main/kotlin/com/vk/kphpstorm/exphptype/ExPhpTypeNullable.kt
@@ -29,6 +29,7 @@ class ExPhpTypeNullable(val inner: ExPhpType) : ExPhpType {
         is ExPhpTypePipe      -> rhs.isAssignableTo(this, project)
         is ExPhpTypeNullable  -> inner.isAssignableFrom(rhs.inner, project)
         is ExPhpTypePrimitive -> rhs === ExPhpType.NULL || inner.isAssignableFrom(rhs, project)
+        is ExPhpTypeInstance  -> false
         else                  -> inner.isAssignableFrom(rhs, project)
     }
 }
diff --git a/src/main/kotlin/com/vk/kphpstorm/inspections/KphpParameterTypeMismatchInspection.kt b/src/main/kotlin/com/vk/kphpstorm/inspections/KphpParameterTypeMismatchInspection.kt
index 3d59633..48224f2 100644
--- a/src/main/kotlin/com/vk/kphpstorm/inspections/KphpParameterTypeMismatchInspection.kt
+++ b/src/main/kotlin/com/vk/kphpstorm/inspections/KphpParameterTypeMismatchInspection.kt
@@ -76,6 +76,7 @@ class KphpParameterTypeMismatchInspection : PhpInspection() {
             val callType = PsiToExPhpType.getTypeOfExpr(callParam, project) ?: continue
             val argType = PsiToExPhpType.getArgumentDeclaredType(fArg, project) ?: continue
 
+            val test = !argType.isAssignableFrom(callType, project)
             if (!argType.isAssignableFrom(callType, project) && needsReporting(f)) {
                 holder.registerProblem(callParam, "Can't pass '${callType.toHumanReadable(call)}' to '${argType.toHumanReadable(call)}' \$${fArg.name}", ProblemHighlightType.GENERIC_ERROR_OR_WARNING)
             }