diff --git a/resources/META-INF/plugin.xml b/resources/META-INF/plugin.xml
index d174e98..e728821 100644
--- a/resources/META-INF/plugin.xml
+++ b/resources/META-INF/plugin.xml
@@ -5,6 +5,10 @@
     <vendor email="koaxudai@gmail.com">Koudai Aono @koxudaxi</vendor>
     <change-notes><![CDATA[
     <h2>version 1.1.5-212</h2>
+    <p>Bug fixes</p>
+    <ul>
+        <li>Fix toml header problem [#271]</li>
+    </ul>
     <p>Features</p>
     <ul>
         <li>Update versions [#270]</li>
diff --git a/src/com/koxudaxi/poetry/PoetryExtrasLineMarkerContributor.kt b/src/com/koxudaxi/poetry/PoetryExtrasLineMarkerContributor.kt
index e7da86c..e974a5c 100644
--- a/src/com/koxudaxi/poetry/PoetryExtrasLineMarkerContributor.kt
+++ b/src/com/koxudaxi/poetry/PoetryExtrasLineMarkerContributor.kt
@@ -18,7 +18,7 @@ object PoetryExtrasLineMarkerContributor : RunLineMarkerContributor() {
         }
         val keyValue = element.parent as? TomlKeyValue ?: return null
         val header = (keyValue.parent as? TomlTable)?.header ?: return null
-        if (header.keyText != "tool.poetry.extras") return null
+        if (header.key?.text != "tool.poetry.extras") return null
         if (keyValue.key.text == null) return null
         val value = keyValue.value as? TomlArray ?: return null
         if (value.elements.isEmpty() || value.elements.any { it !is TomlLiteral || it.textLength < 3}) return null
diff --git a/src/com/koxudaxi/poetry/PoetryScriptsLineMarkerContributor.kt b/src/com/koxudaxi/poetry/PoetryScriptsLineMarkerContributor.kt
index 27caeb8..6a30830 100644
--- a/src/com/koxudaxi/poetry/PoetryScriptsLineMarkerContributor.kt
+++ b/src/com/koxudaxi/poetry/PoetryScriptsLineMarkerContributor.kt
@@ -22,7 +22,7 @@ object PoetryScriptsLineMarkerContributor : RunLineMarkerContributor() {
         }
         val keyValue = element.parent as? TomlKeyValue ?: return null
         val header = (keyValue.parent as? TomlTable)?.header ?: return null
-        if (header.keyText != "tool.poetry.scripts") return null
+        if (header.key?.text != "tool.poetry.scripts") return null
         if (keyValue.key.text == null) return null
         val value = keyValue.value as? TomlLiteral ?: return null
         if (value.textLength < 3) return null
diff --git a/src/com/koxudaxi/poetry/PoetryVersionInspection.kt b/src/com/koxudaxi/poetry/PoetryVersionInspection.kt
index c381fe1..9aefdea 100644
--- a/src/com/koxudaxi/poetry/PoetryVersionInspection.kt
+++ b/src/com/koxudaxi/poetry/PoetryVersionInspection.kt
@@ -32,7 +32,7 @@ class PoetryVersionInspection : LocalInspectionTool() {
             if (file.virtualFile != module.pyProjectToml) return
             file.children
                     .filter { element ->
-                        (element as? TomlTable)?.header?.keyText in listOf("tool.poetry.dependencies", "tool.poetry.dev-dependencies")
+                        (element as? TomlTable)?.header?.key?.text in listOf("tool.poetry.dependencies", "tool.poetry.dev-dependencies")
                     }.flatMap {
                         it.children.mapNotNull { line -> line as? TomlKeyValue }
                     }.forEach { keyValue ->
diff --git a/src/com/koxudaxi/poetry/poetry.kt b/src/com/koxudaxi/poetry/poetry.kt
index 5ea5b74..4cdf308 100644
--- a/src/com/koxudaxi/poetry/poetry.kt
+++ b/src/com/koxudaxi/poetry/poetry.kt
@@ -726,29 +726,3 @@ data class PoetryOutdatedVersion(
         @SerializedName("currentVersion") var currentVersion: String,
         @SerializedName("latestVersion") var latestVersion: String)
 
-
-private fun tomlTableHeaderHasKey(): Boolean = TomlTableHeader::class.memberProperties.any { it.name == "key" }
-var tomlTableHeaderHasKeyCache: Boolean? = null
-val TomlTableHeader.keyText: String? get() = getKeyByTomlTableHeader(this)
-
-
-private fun getKeyByTomlTableHeader(header: TomlTableHeader): String? {
-    return try {
-        when (tomlTableHeaderHasKeyCache) {
-            true -> header.key?.text
-            false -> (header::class.java.getMethod("getNames").invoke(header) as? List<*>)
-                ?.filterIsInstance<TomlKey>()?.joinToString(".") { it.text }
-            else -> {
-                tomlTableHeaderHasKeyCache = tomlTableHeaderHasKey()
-                getKeyByTomlTableHeader(header)
-            }
-        }
-    } catch (e: Exception) {
-        val updatedTomlTableHeaderHasKey = tomlTableHeaderHasKey()
-        if (updatedTomlTableHeaderHasKey == tomlTableHeaderHasKeyCache) {
-            throw Exception("unsupported TomlTableHeader type")
-        }
-        tomlTableHeaderHasKeyCache = updatedTomlTableHeaderHasKey
-        getKeyByTomlTableHeader(header)
-    }
-}