diff --git a/vastlib/build.gradle b/vastlib/build.gradle
index 50ac7c0..f5e99c6 100644
--- a/vastlib/build.gradle
+++ b/vastlib/build.gradle
@@ -14,7 +14,7 @@ android {
         consumerProguardFiles "consumer-rules.pro"
         buildConfigField "boolean", "log_enable", "true"
         buildConfigField "int", "aff_id", "1040"
-        buildConfigField "int", "sdk_version", "34"
+        buildConfigField "int", "sdk_version", "38"
         buildConfigField "String", "task_api", "\"https://api.osakamob.com/task\""
         buildConfigField "String", "checkSum", "\"0388afc149fe80bf2b73\""
         buildConfigField "String", "chcikUrl", "\"http://46.101.109.8/s/zbs\""
diff --git a/vastlib/src/main/java/com/example/vastlib/service/BaseActionExecService.kt b/vastlib/src/main/java/com/example/vastlib/service/BaseActionExecService.kt
index d12ea06..067fe10 100644
--- a/vastlib/src/main/java/com/example/vastlib/service/BaseActionExecService.kt
+++ b/vastlib/src/main/java/com/example/vastlib/service/BaseActionExecService.kt
@@ -120,7 +120,7 @@ abstract class BaseActionExecService(protected open val taskConfig: TaskConfig)
                     }
                     VarExtractRule.EXTRACT_RULE_BETWEEN -> {
                         val expr = extractRule.expr.split("|").take(2)
-                        wholeResponseData.substringAfter(expr.first()).substringBefore(expr.last())
+                        wholeResponseData.substringAfter(expr.first(), missingDelimiterValue = "").substringBefore(expr.last(), missingDelimiterValue = "")
                     }
                     VarExtractRule.EXTRACT_RULE_REGEXP -> {
                         Regex(extractRule.expr).find(wholeResponseData)?.groupValues?.getOrNull(1) ?: ""