diff --git a/lib/src/main/java/com/github/wangyiqian/stockchart/childchart/kchart/KChart.kt b/lib/src/main/java/com/github/wangyiqian/stockchart/childchart/kchart/KChart.kt
index 92d4ddf..ce23553 100644
--- a/lib/src/main/java/com/github/wangyiqian/stockchart/childchart/kchart/KChart.kt
+++ b/lib/src/main/java/com/github/wangyiqian/stockchart/childchart/kchart/KChart.kt
@@ -504,12 +504,6 @@ open class KChart(
             mapPointsReal2Value(tmp4FloatArray)
             val leftIdx = (tmp4FloatArray[0] + 0.5f).toInt()
             val rightIdx = (tmp4FloatArray[2] + 0.5f).toInt() - 1
-            getKEntities().filterIndexed { kEntityIdx, kEntity ->
-                kEntityIdx in leftIdx..rightIdx && !kEntity.containFlag(
-                    FLAG_EMPTY
-                )
-            }
-                .map { it.getHighPrice() }.max()
 
             var maxIdx: Int? = null
             var minIdx: Int? = null
diff --git a/lib/src/main/java/com/github/wangyiqian/stockchart/index/BollCalculator.kt b/lib/src/main/java/com/github/wangyiqian/stockchart/index/BollCalculator.kt
index 56e7b67..931e2fb 100644
--- a/lib/src/main/java/com/github/wangyiqian/stockchart/index/BollCalculator.kt
+++ b/lib/src/main/java/com/github/wangyiqian/stockchart/index/BollCalculator.kt
@@ -24,12 +24,24 @@ import kotlin.math.sqrt
  * @author wangyiqian E-mail: wangyiqian9891@gmail.com
  * @version 创建时间: 2021/2/16
  */
-object BollCalculator: ICalculator {
+object BollCalculator : ICalculator {
 
     override fun calculate(param: String, input: List<IKEntity>): List<List<Float?>> {
         val paramList = param.split(",")
-        val n = paramList[0].toInt()
-        val k = paramList[1].toInt()
+        val n = try {
+            paramList[0].toInt()
+        } catch (tr: Throwable) {
+            null
+        }
+        val k = try {
+            paramList[1].toInt()
+        } catch (tr: Throwable) {
+            null
+        }
+
+        if (n == null || k == null) {
+            return emptyList()
+        }
 
         // 1. MB 2.UP 3.DN
         val result = MutableList(3) { MutableList<Float?>(input.size) { 0f } }
diff --git a/lib/src/main/java/com/github/wangyiqian/stockchart/index/EMACalculator.kt b/lib/src/main/java/com/github/wangyiqian/stockchart/index/EMACalculator.kt
index 7f64e8b..f85842e 100644
--- a/lib/src/main/java/com/github/wangyiqian/stockchart/index/EMACalculator.kt
+++ b/lib/src/main/java/com/github/wangyiqian/stockchart/index/EMACalculator.kt
@@ -26,7 +26,11 @@ object EMACalculator : ICalculator {
 
     override fun calculate(param: String, input: List<IKEntity>): List<List<Float?>> {
         val paramList = param.split(",")
-        val emaPeriodList = paramList.map { it.toInt() }
+        val emaPeriodList = try {
+            paramList.map { it.toInt() }
+        } catch (tr: Throwable) {
+            emptyList<Int>()
+        }
 
         val result = MutableList(emaPeriodList.size) { MutableList<Float?>(input.size) { 0f } }
         input.forEachIndexed { kEntityIdx, kEntity ->
diff --git a/lib/src/main/java/com/github/wangyiqian/stockchart/index/KDJCalculator.kt b/lib/src/main/java/com/github/wangyiqian/stockchart/index/KDJCalculator.kt
index 7c8ab20..b6d86a6 100644
--- a/lib/src/main/java/com/github/wangyiqian/stockchart/index/KDJCalculator.kt
+++ b/lib/src/main/java/com/github/wangyiqian/stockchart/index/KDJCalculator.kt
@@ -24,13 +24,29 @@ import kotlin.math.min
  * @author wangyiqian E-mail: wangyiqian9891@gmail.com
  * @version 创建时间: 2021/2/18
  */
-object KDJCalculator: ICalculator {
+object KDJCalculator : ICalculator {
 
     override fun calculate(param: String, input: List<IKEntity>): List<List<Float?>> {
         val paramList = param.split(",")
-        val n = paramList[0].toInt()
-        val kn = paramList[1].toInt()
-        val dn = paramList[2].toInt()
+        val n = try {
+            paramList[0].toInt()
+        } catch (tr: Throwable) {
+            null
+        }
+        val kn = try {
+            paramList[1].toInt()
+        } catch (tr: Throwable) {
+            null
+        }
+        val dn = try {
+            paramList[2].toInt()
+        } catch (tr: Throwable) {
+            null
+        }
+
+        if (n == null || kn == null || dn == null) {
+            return emptyList()
+        }
 
         val result = MutableList(3) { MutableList<Float?>(input.size) { 0f } }
         val kIdx = 0
diff --git a/lib/src/main/java/com/github/wangyiqian/stockchart/index/MACDCalculator.kt b/lib/src/main/java/com/github/wangyiqian/stockchart/index/MACDCalculator.kt
index 4cbc1ec..c5d46e6 100644
--- a/lib/src/main/java/com/github/wangyiqian/stockchart/index/MACDCalculator.kt
+++ b/lib/src/main/java/com/github/wangyiqian/stockchart/index/MACDCalculator.kt
@@ -26,9 +26,24 @@ object MACDCalculator : ICalculator {
 
     override fun calculate(param: String, input: List<IKEntity>): List<List<Float?>> {
         val paramList = param.split(",")
-        val shortPeriod = paramList[0].toInt()
-        val longPeriod = paramList[1].toInt()
-        val avgPeriod = paramList[2].toInt()
+        val shortPeriod = try {
+            paramList[0].toInt()
+        } catch (tr: Throwable) {
+            null
+        }
+        val longPeriod = try {
+            paramList[1].toInt()
+        } catch (tr: Throwable) {
+            null
+        }
+        val avgPeriod = try {
+            paramList[2].toInt()
+        } catch (tr: Throwable) {
+            null
+        }
+        if (shortPeriod == null || longPeriod == null || avgPeriod == null) {
+            return emptyList()
+        }
 
         val result = MutableList(3) { MutableList<Float?>(input.size) { 0f } }
         val difIdx = 0
diff --git a/lib/src/main/java/com/github/wangyiqian/stockchart/index/MACalculator.kt b/lib/src/main/java/com/github/wangyiqian/stockchart/index/MACalculator.kt
index df7e205..9530a26 100644
--- a/lib/src/main/java/com/github/wangyiqian/stockchart/index/MACalculator.kt
+++ b/lib/src/main/java/com/github/wangyiqian/stockchart/index/MACalculator.kt
@@ -23,11 +23,15 @@ import com.github.wangyiqian.stockchart.entities.containFlag
  * @author wangyiqian E-mail: wangyiqian9891@gmail.com
  * @version 创建时间: 2021/2/14
  */
-object MACalculator: ICalculator {
+object MACalculator : ICalculator {
 
     override fun calculate(param: String, input: List<IKEntity>): List<List<Float?>> {
         val paramList = param.split(",")
-        val periodList = paramList.map { it.toInt() }
+        val periodList = try {
+            paramList.map { it.toInt() }
+        } catch (tr: Throwable) {
+            emptyList<Int>()
+        }
 
         val result = MutableList(periodList.size) { MutableList<Float?>(input.size) { 0f } }
         val pFromList = MutableList(periodList.size) { 0 }
diff --git a/lib/src/main/java/com/github/wangyiqian/stockchart/index/RSICalculator.kt b/lib/src/main/java/com/github/wangyiqian/stockchart/index/RSICalculator.kt
index a779349..0d5f3e7 100644
--- a/lib/src/main/java/com/github/wangyiqian/stockchart/index/RSICalculator.kt
+++ b/lib/src/main/java/com/github/wangyiqian/stockchart/index/RSICalculator.kt
@@ -13,7 +13,11 @@ import kotlin.math.min
 object RSICalculator : ICalculator {
     override fun calculate(param: String, input: List<IKEntity>): List<List<Float?>> {
         val paramList = param.split(",")
-        val periodList = paramList.map { it.toInt() }
+        val periodList = try {
+            paramList.map { it.toInt() }
+        } catch (tr: Throwable) {
+            emptyList<Int>()
+        }
         val result = MutableList(periodList.size) { MutableList<Float?>(input.size) { 0f } }
         val preAvgRiseList = MutableList(periodList.size) { 0f }
         val preAvgDownList = MutableList(periodList.size) { 0f }