diff --git a/modules/flowable-cmmn-converter/src/test/java/org/flowable/test/cmmn/converter/ScriptServiceTaskCmmnXmlConverterTest.java b/modules/flowable-cmmn-converter/src/test/java/org/flowable/test/cmmn/converter/ScriptServiceTaskCmmnXmlConverterTest.java
index a9da14dca6a..e999c9fef73 100644
--- a/modules/flowable-cmmn-converter/src/test/java/org/flowable/test/cmmn/converter/ScriptServiceTaskCmmnXmlConverterTest.java
+++ b/modules/flowable-cmmn-converter/src/test/java/org/flowable/test/cmmn/converter/ScriptServiceTaskCmmnXmlConverterTest.java
@@ -84,4 +84,34 @@ public void validateModel(CmmnModel cmmnModel) {
                 });
     }
 
+
+    @CmmnXmlConverterTest("org/flowable/test/cmmn/converter/script-task-expression-field.cmmn")
+    public void scriptTaskWithExpressionField(CmmnModel cmmnModel) {
+        assertThat(cmmnModel).isNotNull();
+
+        PlanItem planItemTaskA = cmmnModel.findPlanItem("planItemTaskA");
+        assertThat(planItemTaskA.getEntryCriteria()).isEmpty();
+
+        PlanItemDefinition planItemDefinition = planItemTaskA.getPlanItemDefinition();
+        assertThat(planItemDefinition)
+                .isInstanceOfSatisfying(ScriptServiceTask.class, scriptTask -> {
+                    assertThat(scriptTask.getType()).isEqualTo(ScriptServiceTask.SCRIPT_TASK);
+                    assertThat(scriptTask.getScriptFormat()).isEqualTo("javascript");
+                    assertThat(scriptTask.getScript()).isEqualTo("var a = '${testA}';");
+                    assertThat(scriptTask.getResultVariableName()).isEqualTo("scriptResult");
+                    assertThat(scriptTask.isAutoStoreVariables()).isFalse();
+                    assertThat(scriptTask.isBlocking()).isTrue();
+                    assertThat(scriptTask.isAsync()).isFalse();
+                });
+
+        PlanItem planItemTaskB = cmmnModel.findPlanItem("planItemTaskB");
+        planItemDefinition = planItemTaskB.getPlanItemDefinition();
+        assertThat(planItemDefinition)
+                .isInstanceOfSatisfying(ScriptServiceTask.class, scriptServiceTask -> {
+                    assertThat(scriptServiceTask.getScriptFormat()).isEqualTo("groovy");
+                    assertThat(scriptServiceTask.getScript()).isEqualTo("var b = '${testB}';");
+                    assertThat(scriptServiceTask.isAutoStoreVariables()).isTrue();
+                });
+    }
+
 }
diff --git a/modules/flowable-cmmn-converter/src/test/resources/org/flowable/test/cmmn/converter/script-task-expression-field.cmmn b/modules/flowable-cmmn-converter/src/test/resources/org/flowable/test/cmmn/converter/script-task-expression-field.cmmn
new file mode 100644
index 00000000000..f5609cc3580
--- /dev/null
+++ b/modules/flowable-cmmn-converter/src/test/resources/org/flowable/test/cmmn/converter/script-task-expression-field.cmmn
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions xmlns="http://www.omg.org/spec/CMMN/20151109/MODEL"
+             xmlns:dc="http://www.omg.org/spec/CMMN/20151109/DC"
+             xmlns:di="http://www.omg.org/spec/CMMN/20151109/DI"
+             xmlns:cmmndi="http://www.omg.org/spec/CMMN/20151109/CMMNDI"
+             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+             xsi:schemaLocation="http://www.omg.org/spec/CMMN/20151109/MODEL https://www.omg.org/spec/CMMN/20151109/CMMN11.xsd
+                    http://www.omg.org/spec/CMMN/20151109/DC https://www.omg.org/spec/CMMN/20151109/DC.xsd
+                    http://www.omg.org/spec/CMMN/20151109/DI https://www.omg.org/spec/CMMN/20151109/DI.xsd
+                    http://www.omg.org/spec/CMMN/20151109/CMMNDI https://www.omg.org/spec/CMMN/20151109/CMMNDI11.xsd"
+             xmlns:flowable="http://flowable.org/cmmn"
+             targetNamespace="http://flowable.org/cmmn">
+    
+    <case id="scriptCase" flowable:initiatorVariableName="test">
+        <casePlanModel id="myScriptPlanModel" name="My Script CasePlanModel">
+        
+            <planItem id="planItemTaskA" definitionRef="taskA" />
+            <planItem id="planItemTaskB" definitionRef="taskB" />
+            <task id="taskA" name="A" flowable:type="script" flowable:scriptFormat="javascript" flowable:resultVariableName="scriptResult" flowable:autoStoreVariables="false">
+                <extensionElements>
+                    <flowable:field name="script">
+                        <expression><![CDATA[var a = '${testA}';]]></expression>
+                    </flowable:field>
+                </extensionElements>
+            </task>
+
+            <task id="taskB" name="B" flowable:type="script" flowable:scriptFormat="groovy" flowable:autoStoreVariables="true">
+                <extensionElements>
+                    <flowable:field name="script">
+                        <expression><![CDATA[var b = '${testB}';]]></expression>
+                    </flowable:field>
+                </extensionElements>
+            </task>
+
+        </casePlanModel>
+    </case>
+    
+</definitions>
diff --git a/modules/flowable-cmmn-model/src/main/java/org/flowable/cmmn/model/ScriptServiceTask.java b/modules/flowable-cmmn-model/src/main/java/org/flowable/cmmn/model/ScriptServiceTask.java
index 36da3d73ae3..7d06dbcdcdf 100644
--- a/modules/flowable-cmmn-model/src/main/java/org/flowable/cmmn/model/ScriptServiceTask.java
+++ b/modules/flowable-cmmn-model/src/main/java/org/flowable/cmmn/model/ScriptServiceTask.java
@@ -12,9 +12,7 @@
  */
 package org.flowable.cmmn.model;
 
-import java.util.Optional;
-
-import org.flowable.common.engine.api.FlowableException;
+import org.apache.commons.lang3.StringUtils;
 
 /**
  * @author Dennis
@@ -38,11 +36,16 @@ public void setScriptFormat(String scriptFormat) {
     }
 
     public String getScript() {
-        Optional<String> script = fieldExtensions.stream()
-                .filter(e -> "script".equalsIgnoreCase(e.getFieldName()))
-                .findFirst()
-                .map(FieldExtension::getStringValue);
-        return script.orElseThrow(() -> new FlowableException("Missing script"));
+        for (FieldExtension fieldExtension : fieldExtensions) {
+            if ("script".equalsIgnoreCase(fieldExtension.getFieldName())) {
+                String script = fieldExtension.getStringValue();
+                if (StringUtils.isNotEmpty(script)) {
+                    return script;
+                }
+                return fieldExtension.getExpression();
+            }
+        }
+        return null;
     }
 
     public boolean isAutoStoreVariables() {