diff --git a/idea/src/org/jetbrains/kotlin/idea/codeInliner/CodeInliner.kt b/idea/src/org/jetbrains/kotlin/idea/codeInliner/CodeInliner.kt
index 0311d076c0b..6765c02254a 100644
--- a/idea/src/org/jetbrains/kotlin/idea/codeInliner/CodeInliner.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/codeInliner/CodeInliner.kt
@@ -305,6 +305,7 @@ class CodeInliner<TCallElement : KtElement>(
             is KtBinaryExpression -> if (sideEffectOnly) left.shouldKeepValue(usageCount) || right.shouldKeepValue(usageCount) else true
             is KtIfExpression -> if (sideEffectOnly) condition.shouldKeepValue(usageCount) || then.shouldKeepValue(usageCount) || `else`.shouldKeepValue(usageCount) else true
             is KtBinaryExpressionWithTypeRHS -> true
+            null -> false
             else -> true
         }
     }
diff --git a/idea/testData/refactoring/inline/function/expressionBody/DoNotKeepString.kt b/idea/testData/refactoring/inline/function/expressionBody/DoNotKeepString.kt
new file mode 100644
index 00000000000..825fd8cd0ed
--- /dev/null
+++ b/idea/testData/refactoring/inline/function/expressionBody/DoNotKeepString.kt
@@ -0,0 +1,5 @@
+fun manyParams(used: String, unused: String) = println(used)
+
+fun callMany() {
+    <caret>manyParams("op", "qr")
+}
\ No newline at end of file
diff --git a/idea/testData/refactoring/inline/function/expressionBody/DoNotKeepString.kt.after b/idea/testData/refactoring/inline/function/expressionBody/DoNotKeepString.kt.after
new file mode 100644
index 00000000000..8d446ea8bbc
--- /dev/null
+++ b/idea/testData/refactoring/inline/function/expressionBody/DoNotKeepString.kt.after
@@ -0,0 +1,3 @@
+fun callMany() {
+    println("op")
+}
\ No newline at end of file
diff --git a/idea/tests/org/jetbrains/kotlin/idea/refactoring/inline/InlineTestGenerated.java b/idea/tests/org/jetbrains/kotlin/idea/refactoring/inline/InlineTestGenerated.java
index c494abd790c..3fa28b8e36d 100644
--- a/idea/tests/org/jetbrains/kotlin/idea/refactoring/inline/InlineTestGenerated.java
+++ b/idea/tests/org/jetbrains/kotlin/idea/refactoring/inline/InlineTestGenerated.java
@@ -118,6 +118,12 @@ public class InlineTestGenerated extends AbstractInlineTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("DoNotKeepString.kt")
+            public void testDoNotKeepString() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/inline/function/expressionBody/DoNotKeepString.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("ExplicitReturnType.kt")
             public void testExplicitReturnType() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/inline/function/expressionBody/ExplicitReturnType.kt");