diff --git a/src/App.re b/src/App.re
index 058f25fa..e2526c25 100644
--- a/src/App.re
+++ b/src/App.re
@@ -78,7 +78,7 @@ module Menu = {
       <Item href={routeToPath(DistBuilder)} key="dist-builder">
         {"Dist Builder" |> E.ste}
       </Item>
-      <Item href={routeToPath(DistBuilder2)} key="dist-builder">
+      <Item href={routeToPath(DistBuilder2)} key="dist-builder-2">
         {"Dist Builder 2" |> E.ste}
       </Item>
     </div>;
diff --git a/src/components/DistBuilder2.re b/src/components/DistBuilder2.re
index b077f57b..767c13af 100644
--- a/src/components/DistBuilder2.re
+++ b/src/components/DistBuilder2.re
@@ -38,7 +38,7 @@ module DemoDist = {
     let continuous: DistTypes.xyShape = {xs, ys};
     <Antd.Card title={"Distribution" |> E.ste}>
       <div className=Styles.spacer />
-      <DistributionPlot height=200 continuous />
+      <DistributionPlot continuous />
     </Antd.Card>;
   };
 };
diff --git a/src/components/charts/DistPlusPlot.re b/src/components/charts/DistPlusPlot.re
index 9ea8d889..1c957dda 100644
--- a/src/components/charts/DistPlusPlot.re
+++ b/src/components/charts/DistPlusPlot.re
@@ -208,4 +208,4 @@ let make = (~distPlus: DistTypes.distPlus) => {
     );
   <div> chart chart2 {table(distPlus, x)} </div>;
   // chart
-};
\ No newline at end of file
+};
diff --git a/src/components/charts/DistributionPlot/distPlotD3.js b/src/components/charts/DistributionPlot/distPlotD3.js
index 47f39133..73f0caa1 100644
--- a/src/components/charts/DistributionPlot/distPlotD3.js
+++ b/src/components/charts/DistributionPlot/distPlotD3.js
@@ -12,15 +12,14 @@ export class CdfChartD3 {
     this.attrs = {
       svgWidth: 400,
       svgHeight: 400,
-
       marginTop: 5,
       marginBottom: 5,
       marginRight: 50,
       marginLeft: 5,
 
       container: null,
-      minX: false,
-      maxX: false,
+      minX: null,
+      maxX: null,
       scale: 'linear',
       timeScale: null,
       showDistributionLines: true,
@@ -54,11 +53,20 @@ export class CdfChartD3 {
     this.formatDates = this.formatDates.bind(this);
   }
 
+  /**
+   * @param {string} name
+   * @param value
+   * @returns {CdfChartD3}
+   */
   set(name, value) {
     _.set(this.attrs, [name], value);
     return this;
   }
 
+  /**
+   * @param data
+   * @returns {CdfChartD3}
+   */
   data(data) {
     this.attrs.data = data;
     this.attrs.data.continuous = data.continuous || {
@@ -78,6 +86,42 @@ export class CdfChartD3 {
       console.error('Container for D3 is not defined.');
       return;
     }
+
+    if (!['log', 'linear'].includes(this.attrs.scale)) {
+      console.error('Scale should be either "log" or "linear".');
+      return;
+    }
+
+    // Log Scale.
+    if (this.attrs.scale === 'log') {
+      this.logFilter('continuous');
+      this.logFilter('discrete');
+    }
+    if (
+      this.attrs.scale === 'log'
+      && this.attrs.minX !== null
+      && this.attrs.minX < 0
+    ) {
+      console.warn('minX should be positive.');
+      this.attrs.minX = undefined;
+    }
+
+    // Fields.
+    const fields = [
+      'marginLeft', 'marginRight',
+      'marginTop', 'marginBottom',
+      'svgWidth', 'svgHeight',
+      'yMaxContinuousDomainFactor',
+      'yMaxDiscreteDomainFactor',
+      'logBase',
+    ];
+    for (const field of fields) {
+      if (!_.isNumber(this.attrs[field])) {
+        console.error(`${field} should be a number.`);
+        return;
+      }
+    }
+
     // Sets the width from the DOM element.
     const containerRect = this._container.node().getBoundingClientRect();
     if (containerRect.width > 0) {
@@ -134,6 +178,12 @@ export class CdfChartD3 {
     const yMin = d3.min(this.attrs.data.continuous.ys);
     const yMax = d3.max(this.attrs.data.continuous.ys);
 
+    // Errors.
+    if (!_.isFinite(xMin)) return console.error('xMin is undefined');
+    if (!_.isFinite(xMax)) return console.error('xMax is undefined');
+    if (!_.isFinite(yMin)) return console.error('yMin is undefined');
+    if (!_.isFinite(yMax)) return console.error('yMax is undefined');
+
     // X-domains.
     const yMaxDomainFactor = _.get(this.attrs, 'yMaxContinuousDomainFactor', 1);
     const xMinDomain = xMin;
@@ -142,7 +192,7 @@ export class CdfChartD3 {
     const yMaxDomain = yMax * yMaxDomainFactor;
 
     // X-scale.
-    let xScale = this.attrs.scale === 'linear'
+    const xScale = this.attrs.scale === 'linear'
       ? d3.scaleLinear()
         .domain([xMinDomain, xMaxDomain])
         .range([0, this.calc.chartWidth])
@@ -210,16 +260,6 @@ export class CdfChartD3 {
     // Y-axis.
     const yAxis = d3.axisRight(yScale);
 
-    // Objects.
-    const line = d3.line()
-      .x(d => xScale(d.x))
-      .y(d => yScale(d.y));
-
-    const area = d3.area()
-      .x(d => xScale(d.x))
-      .y1(d => yScale(d.y))
-      .y0(this.calc.chartHeight);
-
     // Add axis.
     this.chart
       .createObject({ tag: 'g', selector: 'x-axis' })
@@ -233,6 +273,11 @@ export class CdfChartD3 {
     }
 
     // Draw area.
+    const area = d3.area()
+      .x(d => xScale(d.x))
+      .y1(d => yScale(d.y))
+      .y0(this.calc.chartHeight);
+
     this.chart
       .createObjectsWithData({
         tag: 'path',
@@ -245,6 +290,10 @@ export class CdfChartD3 {
 
     // Draw line.
     if (this.attrs.showDistributionLines) {
+      const line = d3.line()
+        .x(d => xScale(d.x))
+        .y(d => yScale(d.y));
+
       this.chart
         .createObjectsWithData({
           tag: 'path',
@@ -454,7 +503,7 @@ export class CdfChartD3 {
   }
 
   /**
-   * @param {name} key
+   * @param {string} key
    * @returns {{x: number[], y: number[]}}
    */
   getDataPoints(key) {
@@ -473,6 +522,29 @@ export class CdfChartD3 {
     return dt;
   }
 
+  /**
+   * @param {string} key
+   * @returns {{x: number[], y: number[]}}
+   */
+  logFilter(key) {
+    const xs = [];
+    const ys = [];
+    const emptyShape = { xs: [], ys: [] };
+    const data = _.get(this.attrs.data, key, emptyShape);
+
+    for (let i = 0, len = data.xs.length; i < len; i++) {
+      const x = data.xs[i];
+      const y = data.ys[i];
+      if (x > 0) {
+        xs.push(x);
+        ys.push(y);
+      }
+    }
+
+    _.set(this.attrs.data, [key, 'xs'], xs);
+    _.set(this.attrs.data, [key, 'ys'], ys);
+  }
+
   /**
    * @param {string} key
    * @returns {boolean}
diff --git a/src/components/charts/DistributionPlot/distPlotReact.js b/src/components/charts/DistributionPlot/distPlotReact.js
index 9bd9deee..1220b8fe 100644
--- a/src/components/charts/DistributionPlot/distPlotReact.js
+++ b/src/components/charts/DistributionPlot/distPlotReact.js
@@ -46,13 +46,13 @@ function CdfChartReact(props) {
       .set('marginTop', 5)
       .set('showDistributionLines', props.showDistributionLines)
       .set('showDistributionYAxis', props.showDistributionYAxis)
-      .set('verticalLine', props.verticalLine)
+      .set('verticalLine', props.verticalLine || 110)
       .set('showVerticalLine', props.showVerticalLine)
       .set('container', containerRef.current)
       .set('scale', scale)
       .set('timeScale', props.timeScale)
-      .set('yMaxContinuousDomainFactor', props.yMaxContinuousDomainFactor)
-      .set('yMaxDiscreteDomainFactor', props.yMaxDiscreteDomainFactor)
+      .set('yMaxContinuousDomainFactor', props.yMaxContinuousDomainFactor || 1)
+      .set('yMaxDiscreteDomainFactor', props.yMaxDiscreteDomainFactor || 1)
       .data({
         continuous: props.continuous,
         discrete: props.discrete,