diff --git a/src/Psalm/Checker/Statements/Expression/BinaryOpChecker.php b/src/Psalm/Checker/Statements/Expression/BinaryOpChecker.php
index 6373291ec..dbc1a845d 100644
--- a/src/Psalm/Checker/Statements/Expression/BinaryOpChecker.php
+++ b/src/Psalm/Checker/Statements/Expression/BinaryOpChecker.php
@@ -769,6 +769,17 @@ class BinaryOpChecker
                         )) {
                             // fall through
                         }
+                    } else {
+                        if ($statements_source && IssueBuffer::accepts(
+                            new InvalidOperand(
+                                'Cannot perform a numeric operation with non-numeric types ' . $left_type_part
+                                    . ' and ' . $right_type_part,
+                                new CodeLocation($statements_source, $parent)
+                            ),
+                            $statements_source->getSuppressedIssues()
+                        )) {
+                            // fall through
+                        }
                     }
                 }
             }
diff --git a/tests/BinaryOperationTest.php b/tests/BinaryOperationTest.php
index 679e0bcfc..932b95077 100644
--- a/tests/BinaryOperationTest.php
+++ b/tests/BinaryOperationTest.php
@@ -23,7 +23,7 @@ class BinaryOperationTest extends TestCase
             'numericAddition' => [
                 '<?php
                     $a = "5";
-            
+
                     if (is_numeric($a)) {
                         $b = $a + 4;
                     }',
@@ -71,6 +71,11 @@ class BinaryOperationTest extends TestCase
                 'error_levels' => [],
                 'strict_mode' => true,
             ],
+            'additionWithClassInWeakMode' => [
+                '<?php
+                    $a = "hi" + (new stdClass);',
+                'error_message' => 'InvalidOperand',
+            ],
         ];
     }
 }