diff --git a/src/core/dependencies/parser/CircomTemplateInputsVisitor.ts b/src/core/dependencies/parser/CircomTemplateInputsVisitor.ts
index f4c824c..782bdce 100644
--- a/src/core/dependencies/parser/CircomTemplateInputsVisitor.ts
+++ b/src/core/dependencies/parser/CircomTemplateInputsVisitor.ts
@@ -10,10 +10,13 @@ import {
   VarDefinitionContext,
   RhsValueContext,
   TemplateStmtContext,
+  BlockInstantiationExpressionContext,
+  DotExpressionContext,
 } from "@distributedlab/circom-parser";
 
 import { InputData } from "../../../types/core";
 import { HardhatZKitError } from "../../../errors";
+import { Reporter } from "../../../reporter";
 
 /**
  * Visitor class for the {@link https://www.npmjs.com/package/@distributedlab/circom-parser | @distributedlab/circom-parser} package.
@@ -134,6 +137,15 @@ export class CircomTemplateInputsVisitor extends CircomVisitor<void> {
     const expressionVisitor = new CircomExpressionVisitor(true, this.vars);
 
     if (ctx.expression()) {
+      if (
+        ctx.expression() instanceof BlockInstantiationExpressionContext ||
+        ctx.expression() instanceof DotExpressionContext
+      ) {
+        Reporter?.reportUnsupportedExpression(ctx.expression().getText());
+
+        return [0n];
+      }
+
       const expressionResult = expressionVisitor.visitExpression(ctx.expression());
 
       if (Array.isArray(expressionResult)) {
diff --git a/src/reporter/ReporterFacade.ts b/src/reporter/ReporterFacade.ts
index 4575f0a..79b7eea 100644
--- a/src/reporter/ReporterFacade.ts
+++ b/src/reporter/ReporterFacade.ts
@@ -15,6 +15,7 @@ import {
   VerifiersGenerationReporter,
   VKeyFilesGenerationReporter,
   ZKeyFilesGenerationReporter,
+  WarningsReporter,
 } from "./reporters";
 
 import { createProgressBarProcessor } from "./ProgressBarProcessor";
@@ -31,6 +32,7 @@ class ReporterFacade {
   private _setupReporter!: SetupReporter;
   private _progressReporter!: ProgressReporter;
   private _ptauFileReporter!: PtauFileReporter;
+  private _warningsReporter!: WarningsReporter;
   private _circomCompilerReporter!: CircomCompilerReporter;
   private _circuitCompilationReporter!: CircuitCompilationReporter;
   private _verifiersGenerationReporter!: VerifiersGenerationReporter;
@@ -55,6 +57,7 @@ class ReporterFacade {
     this._vKeyFilesGenerationReporter = new VKeyFilesGenerationReporter(quiet);
     this._zKeyFilesGenerationReporter = new ZKeyFilesGenerationReporter(quiet);
     this._circuitFilesResolvingReporter = new CircuitFilesResolvingReporter(quiet);
+    this._warningsReporter = new WarningsReporter(quiet);
   }
 
   public setQuiet(newValue: boolean) {
@@ -219,6 +222,10 @@ class ReporterFacade {
     this._progressReporter.updateProgressBarValue(valueToAdd);
   }
 
+  public reportUnsupportedExpression(contextText: string) {
+    this._warningsReporter.reportUnsupportedExpression(contextText);
+  }
+
   public verboseLog(namespace: string, formatterStr: string, logArgs: any[] = []) {
     debug(`hardhat-zkit:${namespace}`)(formatterStr, ...logArgs);
   }
diff --git a/src/reporter/reporters/WarningsReporter.ts b/src/reporter/reporters/WarningsReporter.ts
new file mode 100644
index 0000000..10cc82d
--- /dev/null
+++ b/src/reporter/reporters/WarningsReporter.ts
@@ -0,0 +1,11 @@
+import { BaseReporter } from "@src/reporter/reporters/BaseReporter";
+
+export class WarningsReporter extends BaseReporter {
+  public reportUnsupportedExpression(contextText: string) {
+    if (this.isQuiet()) return;
+
+    console.warn(
+      `Expression structure: ${contextText} not supported if the expression is used to determine the dimension of input signal!`,
+    );
+  }
+}
diff --git a/src/reporter/reporters/index.ts b/src/reporter/reporters/index.ts
index 97c1d1d..49e25db 100644
--- a/src/reporter/reporters/index.ts
+++ b/src/reporter/reporters/index.ts
@@ -2,6 +2,7 @@ export * from "./BaseReporter";
 export * from "./SetupReporter";
 export * from "./ProgressReporter";
 export * from "./PtauFileReporter";
+export * from "./WarningsReporter";
 export * from "./CircomCompilerReporter";
 export * from "./CircuitCompilationReporter";
 export * from "./CircuitFilesResolvingReporter";